Hi,
Wolfsocks!
I am sure he doesn't have BPD but I don't want to slip into a new situation where I am compensating for somebody else's failures. The fact that he is my twin makes it double hard.
It sounds like you're feeling responsible for how your twin is behaving and that it's raised some questions about your role in your former relationship. I can relate to what it feels like to feel like the responsible one.
How are things going this week? Have you addressed any of the issues that are bothering you?