Hello nofu,
Like others said it is a difficult situation. I am wondering what your children's opinion on the matter may be as you mentioned it may leave them in a difficult situation. I am partly coming at it as an adult that wished my parents would have divorced earlier throughout my entire childhood.
It may send him into drunken chaos but he should not be your responsibility. I gather that you still have a heart like all of us, so maybe try to force him to go to therapy or get other kind of help before breaking up? I am also coming out of a difficult relationship with someone that likely has borderline personality disorder and at least when we were together I could see he had schizophrenic traits. My ex-beloved and I did live together for an amount of time and it was exactly like taking care of a child, he went to university (when he was not too depressed) and I worked, paid for everything, had my own studies, and took care of the house, cooking, and him. I accidentally gave him an ultimatum saying that he had to get help and I could not be in a relationship with him because we were both too unstable and he nearly ruined my life and sent me to prison. It is similar to your story Gallactic Gorrilla except it went a bit more both ways and I took the blame and responsibility to protect him. Anyways he took it as: if he gets help (which I now hear he is doing) we may get back together in a healthy relationship. I understand that it is difficult to do emotionally. I am in the rut that I still love him and hope he is happy and want him to be happy. He was not happy in the relationship with the huge ups and downs, arguments, and depression. I hope that this forces him to take care of his issues and that he will be happier in the future, even without me. I did not help him I probably just encouraged the behaviour because I am used to being abused, abandoned, and let him manipulate me into whatever he wants. Because we had a very close relationship and emotional connection it is really hard for me to let go and imagine that maybe in the future we will never see each other again, despite the fact that I still love him. It kills me to have done this, but I did not have a choice because of how taxing this is on me and I have my own issues to deal with (that I am just starting to deal with). I am younger than you are and in a different situation, but I thought I would share anyways. Maybe giving him an ultimatum and some time will make him realize what he needs to do, call it a separation instead of a complete divorce.
This is more a general comment to the thread.
I am at a hard point at the moment. Legally I am not allowed to talk to him unless he signs a piece of paper saying that he approves of contact/communication (I spent upwards of $25K to get that). The law got into it because he accused me of trying to kill him, while in the psych. ward of the hospital where I called to have him placed because he was threatening suicide. I am not blameless I have been depressed and suicidal for several years and we talked openly about it and doing it together. I usually found the means and thought of many plans. Nevertheless he was very emotionally abusive, blamed me endlessly for everything that went wrong, he was manipulative, kept me up until 2am to complain about his depression or abuse me emotionally or physically for a month straight. He had huge mood swings and went from idolizing to devaluating me and hating me. I allowed him to move in with me, but he would run back and forth between his parents and myself whenever there were problems with either one of us, to the point where he felt unsafe at both places. Overall he fits the criteria for BPD. I decided not to accuse him of the same thing and give the police the complete picture because I saw no use in getting him in the same legal problems, which he may not know how to defend himself from. This also nearly ruined my academics and I had to stop my research. After nearly a year of legal battle and going to jail (twice, last time on my birthday thanks to him) I was able to get an agreement where I admitted I breached and talked to him when I was not supposed to and if he approves of communication I can talk to him, but only if. He still has not signed it. He seems to expect me to talk to him and breach, as I have done in the past. All he has to do is sign a *insert swear words* piece of paper. Last I talked to him was before the ruling (again taking risks) and that is when I told him that I cannot stay with him unless he gets help. Last week my probation officer accidentally initiated a slew of text messages and emails from him asking for us to see each other again, saying that he is better and went to get help, accepts part of the blame, etc. But he still expects me to give him a sign or tell him to sign the piece of paper, which is not something I can do. That or breach entirely and who cares if he signs or not. I would rather not loose everything I had to fight to regain after the horrible mess he put me through. Oddly last Wednesday I had an exceptionally strong dream about him where I was almost up and going on sites we were both on. Then that day is when he started asking to see me again. Then he asked again on Saturday and I could not go to bed until midnight (I usually go to bed at 8:30/9). He pretty much sent me back 3 months in the therapy I was doing and accepting that I cannot be in a relationship with him. When I do go to sleep I have an exceptionally vivid and detailed nightmare, much worse than the others I had about him when I first separated from him (I had nightmares about him every night for a few weeks). I did not sleep at all last night, hurray! The meds did not work. -I've had sleeping problems and severe migraines since I was a child, finally found something that helped me sleep and helped with depression/anxiety (buspirone) without knocking me out like most sleeping medications and make me feel groggy like most antidepressants and anxiolitics.- I noticed I can identify emotions through music and actually feel through music, so again and again I still hear the songs I associated with him and being forcibly separated by the courts. I had no idea what to do even if he signs the paper. I talked to my therapist and we agreed that I could talk to him and see if he is better, but let him know my boundaries and not start to see him again as neither one of us are healthy enough. I could not live with myself if I simply ignored him or brushed him off.
It is like cupcakequeen mentioned "we allow ourselves to be". I had a very abusive childhood and probably seek out a partner that is similar to my parents and so one that is likely to be abusive. I was in other relationships before but I felt nothing for the other person, where i was in a surprisingly healthy relationship with. Due to the abusive childhood I nearly think it is normal. In a way having Aspergers may make things worse as we may have a harder time noticing the social cues and depending on our upbringing because we are quirky we are ostracized from society and are more sensitive than NTs to that. I used to call myself an alien and wondered where the hell I came from as I did not belong and still do not belong (save by "acting", wearing a mask, faking being normal) in society. I noted I tend to feel emotions more strongly and for longer, but cannot easily identify them or show them compared to most other people. We also have difficulty showing emotions which can lead to a great deal of misinterpretation with anyone. That is a less existentialistic way of explaining the tendency but we still have to relearn what is a normal relationship and notice social cues.
Sorry long reply. I hope it helps someone and maybe someone has some recommendations?