Movie is very realistic. When I've dealt with married bisexuals, they seem to be like this. Scene after scene has happened to me in real life. It was ultimately painful to watch. One thing that the movie points out I'll agree with is that it seems that bisexuals put a lot of time and effort into developing their relationships with their male consorts.
Another pattern I noticed in real life is that when a married bisexual man has a relationship with a gay coworker, the managment seems to fire the gay man and tries to retain the bisexual married man, especially if he has children. Even if he's divorced. (Like I said, this movie was PAINFUL)