Bi-polar. That's a tough one. I'm hoping she is medicated and in counseling because that sickness is a relationship time bomb of epic proportions. In my experience, they need you during their depression and they love you around during their mania... until you try to pull them back from their mania. That's when they push you away because you're ruining their fun. They make you the bad guy and victimize themselves, ensuring they aren't feeling guilty about anything. At least, that's what I've found in my experience... and it's be one heck of an experience.