AS may not always be THE reason people break up, but it's certainly a factor. Even if it's not a cause, it's something that has to be taken into account.
Occasionally I get the sense that a neurotypical person has come here just to seek justification for ending something, I recently read an NT say that they wanted to learn more about us so as to avoid us in the future. Not nice. But the majority seem to be here to learn more because they care about one of us, and I wish that more NTs were willing to learn more about us.
I am hoping to find a person so share my life with, and chances are that if I do they will not be on the spectrum. This is not an easy task, and I need to learn about this if I'm to be successful. Conversation with NT women trying to make romance work with an aspie guy is, for me, a great opportunity that I wish would happen more in real life. I'm sure that I'm not the only aspie who finds the presence of such people to be a valuable part of this site.
I'm sure that I would find many threads here irritating if I were forced to read them all. I'm not forced to read any.
I suppose whether or not I were offended by an ex asking why we broke up would depend on the circumstances. If it were due to miscommunication that would be quite reasonable. The vast majority of problems I have had in this area are due to miscommunication. A third party is often good for this sort of thing, hence arbitrators, mediators and relationship counsellors.