Tony,
Beyond the issue of children, it would seem we are tiwns in this situation. It's a tough road to hoe anyway you look at it, but you're doing great so far.
If it comes about to be anything like mine, don't be surprised if this guy ends up just being a user and once he gets what he's after, taking off. In the meantime, hang in there, still do your part on working on things with your wife and show her that you've overcome your downfalls of the past and if she's wise, she will realize the errors of her ways and return to work on things. In the meantime, prepare yourself for a whole new set of rollercoaster emotions because you may know what is happening as far as her seeing someone else, but now the rest of the nagging questions start. Drop me a PM if you need anything.
Rick