@dirrtydozen22,
Behavioral boundaries, not the least about behavior at work.
You don't seem to have understanding of sensible behavior between people in different situations, including at work. I don't blame you, I think it's an effect of some of your diagnosed problems... which you should talk with your therapist about, or get a new one.
You also are holding on to a messed up situation from, now, years ago, when the rest of us deal with people not liking us a lot of days of the week, or, if not a lot of days of the week, at least once in a while.
It's an eye roller for us to read you are still on about one person not liking you, and, for you, some kind of block for your moving on.
But - if you move on, someone else may not like you. That is the way of the world, that we all deal with, some better than others.
I'm sure I wish you well, to jump out of this obsessing about a person not liking you, and think most other posters who have responded to your posts do too.
I think you are pretty smart and hope you can get a handle on this stuff.