The Bipolar hasn't ruined the marriage. I really don't expect it too either.

Here's why:
I know how I was before the Bipolar. So, when my behavior,attitude, and perceptions become altered - I am able to recognize it. At that point I let my wife know that I may be difficult and not realize it right away...and that it is ok for her to point it out to me. I promised not to take offense and so far this has been successful.

Yeah, It takes extra effort, but I want to stay married. A little extra honesty goes a long way. Just think about the last time you snapped at your partner because you had a headache or were tired and they were unaware of your current state. Instead, if you say, "honey, I can't deal effectively with this right now because I have a headache", your partner will be much more understanding.

my 2c