Hey all,

Pretty new to the BPD game. Briefly dated this undiagnosed girl a couple months ago and it opened my eyes to how truly volatile the BPD-afflicted can be. For context, when we started dating I was 21 and she was 28. Now, naturally, I'm 22 and she's 29. We broke up at the 7-month mark because she was cheating on me with my roommate. Some periodic hook-ups followed for the next two months until I finally decided to cut all contact.

That lasted about three months. Recently, we've been having sex again and boy oh boy is it amazing with her. Even better now, what with all the history we have at this point. And don't get me wrong, I know she sleeps around with multiple men and has unprotected sex all the time (I know because we have unprotected sex all the time), but I am still very much attracted to her and hold a great deal of care and affection for her.

My question is: What exactly drives the erratic shift she cycles through between caring for me and degrading me?

The other night we went to a drive-in movie and when heading back to her apartment she started freaking out for no reason to the point that she angrily threw her purse on the ground and ran to a nearby park where she subsequently laid face-down on the grass and kicked her feet to the floor for about 5 minutes, complaining about something I supposedly did. Keep in mind, this woman is about to be 30. I am literally 22 and just graduating college.

But most of the time, she's happy to cater to my every whim and desire: Makes me food, feeds me, cleans up after me, compliments me all the time. Then she'll turn right around and talk to me like I'm lower than dirt.

I've decided she's far too unstable too ever pursue a committed relationship with her again but I genuinely love who she is as a person and our interpersonal chemistry/connection is seriously off the charts (not to mention the sex is mind-blowing). My only question is:

What in the hell goes on in the BPD mind when switching from love-bomb to tantrum mode? Is there anything I can do to better manage it? She's moving across the country soon so I just want to make sure we have as memorable a time as possible while minimizing her periodic freak-outs and tantrums.