Bipolar Depression

I'm a 31 year old mom who is dating a woman with BP 1 she is planning on moving in with me in the next few months. We have some serious issues. Mostly trust issues. She has issues with hypersexuality and attention seeking issues.
She has been on several medications; Welbutrin, lamictal even rispirdone. She has OCD and has cut in the past (Not since May, we're both happy to admit) she has also had binging & purging issues. There have also been instances where her suicidal thoughts have been scary... both for her and for me. Since she doesn't like making phone calls I have on 1 occasion called a local suicide hotline for her. I think it helped but at times I'm worried it's not enough.
When she found this site, she thought it would help me be able to talk about what's bothering me. I've got to admit I'm a little intimidated talking about our private life, but at the same time... I am looking for answers.
At times I'm frustrated; wanting to listen, help and make everything alright for her again. Yet I feel powerless against the BP. To be honest it scares me to think I could lose her to this disease.