Congrates on the little guy. Sorry you have to go through the prego OW experience. That's a tough experience(PA)/lesson(child) to go through and very hard to shake from your life. However it sounds like your up to the task. Most people take a few marriages to learn what your husband just did, that the challenges in marriage are the same regardless of which relationship, it's how we choose to look at them and work at the relationship that makes the outcome better. (This was relayed to me by a man in his second M. His Dad told him this while the Dad was in his third M.)
You can't tell me children don't learn relationship skills from their parents. Hopefully your H has learned his lesson and is now fully committed. I wish you luck.