You know, I've wondered the exact same thing with my husband (he's bipolar, not me). Maybe we just don't know how to communicate, and that's why he always gets so mad at me. Maybe I'm saying the wrong things.
But in my case I know it's the bipolar that is barring us from communicating. I guess I was lucky (or unlucky, depending on how you look at it). I got to know my husband before he had his first bipolar episode. He had always been "normal" for the years I've known him. And this is how I know that we don't have a communication problem - we've never had this problem before his bipolar reared it's ugly d*mn head. Plain and simple.
Have you, in previous relationships, had the same problems?
Coal