I'm so sorry you are struggling.

It is so hard to feel so alone. Even for those of us that are introverted need to feel supported and cared about. Feeling rejected is an awful feeling as well. It sucks to have "fair weathered friends," and I've struggled with that too. A lot of people don't take the time out to really learn about Bipolar Disorder, and things would be so much better if people would show more empathy.
I feel that Bipolar does interfere with my relationships at times. I wish that I had more of the ability to keep up with people and socialize more. Sometimes depression interferes with my energy level. I need to get out there and meet more people, but my motivation level is low. It would be nice to have a stronger support system.