Welcome Dal37. It really depends on the person, but I think it says a lot for your wife that she let you know what happened. That took a lot of courage on her part. I have never cheated on a partner and have had BP symptoms since I was 8 (I was diagnosed a 31). I think it also depends on how severe the manic episode is. In Bipolar II the person will not have full blown mania it will be something called hypomania which is less severe.

Bottom line is now that your wife knows about her diagnosis she does have control over how she manages the illness. i.e. taking medication as prescribed, keeping a sleep schedule, going to therapy, eating properly etc.

The book in my signature is for spouses, family etc. It's excellent.