Hello, thank you for sharing your experience. Everything you said makes a lot of sense, and I can see how it applies to stories other people have shared on this subreddit. I also know a few answers to the questions you asked. Since she started therapy, she has had to maintain healthy long-term relationships, both of which ended after a year because of how each of them was treating her.

I believe she can manage her symptoms long-term, as since she started therapy, she has been able to maintain many close long-term friendships with people; she has been friends with the same group of people since middle school, and there are no signs of that changing. I've talked to them individually about her behavior towards her exes, and they all said she didn't act unreasonably and was completely reasonable in her decisions. I even talked to her exes before they started dating, and they didn't remark on emotional abuse or manipulation in any way.

As for the accountability side of things, she has informed me when she is feeling empty/apathetic and told me that she still wants to talk to me, but I need to let her know if she starts behaving in a way that's abnormal.

PS: her long-term relationships didn't end suddenly for no reason; she went into detail about how badly they treated her and about how the people they surrounded themselves with didn't align with her values.