I think that a 90% divorce rate might be a little harsh. I hope so at least. I am bipolar, and have just got engaged. I have been with him for 8 years already, and I think the most important tool for keeping our relationship smooth is communicating where I am at. I track my cycles, and I always tell him when I notice a change. I also have a good idea of my behaviors, and I let him know what to expect during different times. sometimes I will just send him a text saying "I'm manic" and then if I act strange he knows why, and he knows what to expect from me when I'm manic. ect.