It's out there. It's harder to find with when you have BPD because we tend to hold onto relationships that are unhealthy for us, but it's there. The continual process of discovering who we are is the key to find these healthy and fulfilling relationships.
That relationship may or may not have continued if you did not have BPD, but the important thing to remember is that relationship was not right for either or both of you at that point in time.
Another lesson I've learned is that
attachment doesn't always necessarily mean it is love. For me, I've learned that it has to do with abnormalities with my amygdala (specifically hyperactivity), which has been shown in patients with BPD (
http://www.ncbi.nlm.nih.gov/pubmed/14643096). I got an MRI a few years ago indicating this. Anyways, the amygdala has a lot to do with moderating attachment (
http://www.ncbi.nlm.nih.gov/pubmed/16284946), so when we find someone, because of all these chemicals this little almond shaped part of our brain starts pumping chemicals into our brain, we say "HE IS TOTALLY THE ONE!" without moderation and without consideration to our own personal growth, development, wants, needs and what makes us happy.
My personal key to self discovery has been through a lot of things to regulate my emotions and attachments. Meditation, specifically guided meditation has helped a lot. I just started yoga, and that has been such an amazing influence in my life thus far. Performance art has always been with me. I always used it to express ways I could be happy, but am just recently am starting to express the other emotions.
I also took some time to "date myself", which essentially consisted of me thinking every day for a few months, "How would I impress MYSELF today?" I took time to think about, when I had nowhere to go (taking the social pressure off and avoiding my, er, 'adaptation techniques' from being so externally referenced) and no one to impress by myself, what actually made me feel good and happy. DBT will be next on my list of ways to live life more fully.