Well, I married a woman, though she knew I was an out gay man at the time.
It so happens she's my best friend and soul mate, and we decided a life together was what we wanted with all the strange baggage such a decision would entail. We're just shy of 20 years, and it was the best damn thing I ever did. It has made us both very happy.
So, from my experience, it _can_ work very well. But then we started from complete honesty. This guy's story is a recipe for a total disaster. He's using her and that isn't going to work out well at all...