I would agree with the previous post. Persons are driven by what they can't have. My exW wanted the divorce initially, and then I wanted it. As soon as we were divorced and I had met someone she suddenly realized her mistake, regretted her actions, and wanted me. I sometimes also thought about her but thank goodness I came to my senses. It's a normal process to long for that relationship we lost. It is not normal to get a D and remarry that person. Think about how messed up emotionally and decisively we'd have to be to do that.
I also agree that we start to rationalize everything - "It wasn't that bad, I could have X with my ex but only W with my current, etc.". It's never ending and if we look at it that way we'd never be happy with what we have today.
I would bet that if your ExH met someone that his feelings for you would change pretty quickly.
