Hey visiblestars, I have attachment difficulties too.
In my case I'm a control freak, I like to think that if everything is perfect than is all is well, the smallest flaw is anarchy. So I tend to see everyone as unreliable and dangerous, so people are the enemies that I can't help but love.
Advice huh :/? BPD is incurable, you'll need to adapt to it sadly, though I hear Dialectical Behavioral Therapy (DBT) has been met with praise in the BPD field. To be honest, I'd suggest seeing a psychiatric doctor if you haven't already, therapy too. Personality Disorders are extremely complex and highly overdiagnosed. In the meantime, try to ground yourself if you become emotional and keep preoccupied when you're on your own. Easier said than done I know, but laying down to die won't be too peachy either.
Good luck, if I think of anything useful than I'll let you know .