I'm so sorry you are hurting right now. It doesn't sound like bipolar to me, more like a personality disorder. That's a different issue but requires a great deal of acceptance on your part that what he says he means and it's not just the 'illness.' He wants to just be friends, unfortunately you can't make someone be your lover unless they want to. Relationships work when you both are in love. Both want to stay together. If someone just wants to be a friend, you have to accept that. Take care.