If I were in a reasonably happy, functioning relationship, no, not a chance.

I know first-hand how terrible it feels to have a spouse who isn't faithful, one of the worst things I've ever experienced, and I won't do that to someone that I love, even if we're having problems. If the old relationship was a really bad one, I'd possibly end it and pursue the new one, but I wouldn't pursue a new relationship while in another one.

Carol