For many many years I considered keeping my orientation a secret. Up until last year, only myself, my ex pastor, and an ex accountability partner knew about me. I was considering getting married, or at least finding a girlfriend to start with.
It's only a movie, but Brokeback Mountain echoes the lives of many frustrated men who are living a lie.
Personally, if I were to consider getting into the "pretend" lifestyle again, I believe I'd end up hurting too many people. It's not in my nature to go behind my partner's (in this case a wife) back to seek gratification, however I can understand why many people would. I'm not agreeing with it, but I understand.
In my opinion, in any kind of relationship, if a partner commits adultery, it should be a sign for the other to run in the other direction very quickly.
Adultery indicates a breakdown in a relationship, lack of communication, and proof that things are not working out.