I was married once before to a man that did not have bipolar and he was a chronic, hardcore cheater. It's their life; they've raised two sons together and are still together.
Realize that people with bipolar disorder cannot control their bipolar symptoms (except, to some degree, by preventing them ahead of time), and they cannot "snap out" of their manic or depressive states by sheer willpower.
You can offer support by being a listening ear and remaining nonjudgemental, no matter how crazy your date's thoughts may seem to you. “Bipolar Disorder and Dating Relationships." https:// Web MD.
Although many folks attribute affairs to a number of things, such as mid-life crisis, just making a terrible mistake, cheating because they love themselves more than anyone else...there is also the unfortunate symptom of hypersexuality in bibolar that can result in an affair, as well. It is unfair to the other person in the exclusive relationship and no excuse given can help the sting.
There has been alot of discussion on this in the past and I feel maybe it is something we need to talk about on this forum, again. I had to experience this firsthand to fully understand the different aspects of cheating. And I've heard she had at least one affair, herself.
Therefore, make sure not to guilt your date into staying up too late or eating a full box of chocolate with you.
You may even want to suggest that the two of you take a walk or play a sport together in order to keep his symptoms of bipolar disorder at bay.
BUT, hypomania is something that can be more easily controlled with proper medication, knowledge and acceptance of the illness, desire to be faithful.
This doesn't mean a person suffering with hypomania will not fall into an affair, because they certainly can as a result of the above mentioned hypersexuality and lack of impulse control.
Similarly, realize that certain actions have a high likelihood of making bipolar symptoms worse.