It sounds really tough but the OW will have less and less to offer in the long run. I only know this from my family experience. The OW may have to be a step parent eventually and yes, there are success stories but it is ideal to have both parents together. I was also a lot like your W and boy, was my H's affair a wake up call! I am also dating yet dumping the man who offered what my H could not but he is too bad to have around my kids so what is the point. Although I love my H I am not attracted to him so I get your point there. If there was a way to rebuild trust, open communication, a get that fire lit, you may be headed on the right path back to your marriage. It is very possible.
Me:38 H:39 MLC M:10 R:23 years D6 S3 Bomb: Easter, 2007 "Every day may not be good, but there's something good in every day."