I tried to list it down with the hope that we can discuss it when things are calm. However, before learning he possibly could have BPD, I would communicate in a way that is not best. I would literally say "are you projecting right now?" which I think is the worst thing you can say to a BPD.
I think many of us have done the same. I can see how asking if he was projecting could cause him to feel invalidated. Don't beat yourself up though. YOu were only responding the best way you knew how with the information you had. Now that you know, you can start new patterns.
It's amazing how far a little
validation for our pwBPD can go.
I think it's great that he is sharing with you what he is feeling instead of yelling it at you. Sometimes when I can tell my H is sharing but it's hard for him, I'll just say "Thank you for sharing that with me. It means a lot to me that we could talk about it together." He loves it and can see that I really do care.