I'm very sorry this happened to you.

I have a similar thing but it goes the other way. I'm the person with old friends I never want to see again because of how they hurt me. One of them recently reached out to me after about 8 years, but I'm still very upset at them. I was completely betrayed by them and I actually made a post about here on the bored called "unexpected contact," which actually tells the whole story about why I can never trust any of them again.

So,you didn't say exactly what the falling out was. But, I think everyone has lines that once you cross them, there is not going back. On another note, though, there's also the idea that sometimes with bipolar comes some psychosis. And often that manifests as paranoia. And, that paranoia can latch onto things and make them look worse than they are. Sometimes, it goes away and you realize that it was illogical. Sometimes even if it goes away, you got yourself so worked up on what happened, you can't even remember what actually happened, and so you never heal from it.

So, I dont' know how long ago this happened. But maybe give it more time. Like that old saying about "if you love someone let them go." I don't think that's just necessarily for romantic relationships, but all relationships. And, it sounds like you've done everything you could do. You appologized, reached out, and everything that you needed to repair things. Now, it's really up to them, and there's nothing you can do but let go and just see what happens.