I'm not saying that all bipolar people will act this way. I'm saying that if you don't know what you're dealing with, you have to be prepared for the worst. Note that I said that *IF* she was bipolar I with psychotic features, which is pretty much the worst case, that those are the kinds of things he needs to be prepared for. He said that one day she decided she was upset with him and disappeared. That may be due to a number of things, but it is also a familiar symptom of bipolar psychosis. It certainly sounds like there is a lot more to it than that she PMS'd hard one day and stopped talking to him.