I don't know the specifics on the ending of the affair b/c I never asked. All that H volunteered was that she was too young. However, I know that she cheated on him at least once during their affair and the "OM" went around bragging about it. I'm sure her cheating played into the final split.
He said that they had been apart for several months when he began initiating contact with me again. I don't know if he went through withdrawal but I'm sure he did to some extent because they had been together for 5 years.
He did say that she never loved him like I loved him.
However, I take everything that H says with a grain of salt, especially with regard to the affair. He had to have felt something for her or their R would not have lasted 5 years. The OW in both our sitches apparently met some need (albeit temporary) that our H's thought they were missing with us. In my case, one attraction was their mutual love of alcohol.
After we split up in 2005, H told his mother that he would never marry the OW and he didn't. After he begun his affair, he brought the OW around his family immediately and practically shoved her down their throats. For awhile, they seemed like one big happy family but it didn't last long. The family is splintered now.
H also lost contact with his kids (both from previous M and ours).
I'm surprised that your H married his OW but the fact that he has kept her hidden from his family is interesting. Maybe his family was more supportive of you and your M than mine was. If so, then he would want to avoid any grief or shame by keeping her away.
In any event, it doesn't sound like a M that has much chance of surviving.