You know, Vlad, past behavior is the best indicator of future behavior. BPD chick, like you, like me, like everyone, has patterns to her behavior. Behaviors are the same as habits, okay? And habits, you know, are difficult to break. Some people have habits/behaviors for years, it's not gonna change all of a sudden, just because. It's entrenched in them.
When they stress, when things get tough for them, the easiest thing for them to do is to simply go to their pattern, their habit, their behavior. So odds dictate that under the same or similar circumstances, BPD chick is gonna do the same shyt as last time. Just like you're doing, because this is habitual to you. And the same shyt will happen to you as has been happening to you until you change what you're doing. Simple as shyt, really.
You gotta wonder WHY after a few months of silence, she comes out of the woodwork and demands that you commit. To me, a chick who's not been around me for several months, isn't growing more in love with me. If she is, it's her imagination at work, right? So if she says she wants a commitment, and her imagination got her there, especially given the fallout you guys experienced previously, man, that's a HUGE RED FLAG that she's not all there. Either that or she feels she can't do better and wants to lock you in (that's still a flag!). But I think you know that.
I'd wonder also why you have this thing about wasting your time playing little games like the "I love you" that you're doing with BPD chick. I mean, wouldn't you rather spend your time with a somewhat more normal chick? That's why I figure you like this sort of stuff, this drama, this kind of roller coaster you got going, feeds your self esteem or something? Otherwise, you'd be jumping off the roller coaster and looking for a smoother ride, no?