WAH says he wants to work on the M

[kjensen]

The book BND mentionned is excellent: How Can I Forgive You by Janis Abrahms Spring.

My two cents: First figure out if you want to forgive and figure out if you think you can forgive. Also consider, what will it take your H to do or say for you to feel you are getting the things you need in a marriage (honesty, trust, .etc)
Then consider, can/will your H do or say what needs to be said/done? H needs to commit/work at this, but it is work on your part too. He may not quite be as ready as he thinks if he still has the OW on his mind/in his life.

BND has made good points on 'becoming the greener pasture', so to speak. Definitely worth considering from H's point of view. Creating a new marriage doesn't just mean your needs must be met, his needs must be met, too.