Yeah Little, in my experience that is what people do who don't like to face difficult emotions or confront a situation - they hop into a new relationship or cheat to make that transition easier. They don't feel strong enough to do it on their own or to communicate with their partner.
I'm with Jefe, this thing with OW will definitely not work out. Sounds like some serious drama just waiting to happen. And it shouldn't take very long. Depending on how relaxed your boyfriend is, I'd give it only a few months tops.
