Ah, abandonment. If I knew how to deal with it, then I wouldn't be having the same types of problems as you, but I can definitely reassure you that we're here for you whenever. I honestly don't think he's going to be breaking up with you. I mean, despite it all, he wants to marry you, so there must be some truth to him saying that he understands your BPD, right?

Hang in there! We're all here for you no matter what happens!