I am not surprised that you would feel uncomfortable using the word Abuse,
@the_tortoise , because part of what abuse does is to undermine us, and make us feel like we deserve it, that we are wrong and broken.
However it is presented, this is abuse, it is a misuse of power that has steadily undermined you, and because you are dependent on the person you have had little choice but to put up with how they treat you.
I understand what you mean about feeling bad about what you say to others about this, and frankly it doesn't really matter whether you use that word, you can just quote the behaviour and what is said, and allow others to form their own conclusion.
I don't think this person would still be around you unless they were dependent on you, they are able to avoid their own issues while they critique you, and my guess is also, that your gentle and sensitive ways are balm to them.
If you had the means, you would have gently and kindly detached yourself from them, I imagine. If there's any way to get others to help you do that in a way that works for you, then I would say, just describe the behaviour and what is said and done. That speaks for itself.