When I was reading one of the posts I came across a statement about primary attachment. That when we feel emotionally needy we turn to our primary attachment. If we haven't moved on after the breakup that would be our ex. Ok say I finally manage to shake her once and for all but still am single. Do I really require attachment?
I think the meaning is that the break up with a BPD is like losing a primary attachment like losing a parent? You have to be generally happy alone to be happy in a relationship in my opinion. It's just like people who win the lottery: the people who were happy before winning will probably remain happy, the people who were unhappy before winning will probably remain unhappy.
So the healthiest people probably can be happy alone but are happier when genuinely sharing their life with somebody they love and that loves them in return. If you can't be happy alone, then you will probably be plagued by fears that you are unworthy of love and will find it difficult to accept it. Sounds a lot like what BPD sufferers must feel like?