So glad your H is reaching out to you. It could be that things are not going so well w/OW. Like the statistic says, most affairs end very fast.
Besides, he is also getting to know this side of you. He probably expected you to have a b***h fit and bother him, instead you are moving on and is doing well without him. As much as we think they just forgot us, I don't think it is the case. Your H thinks about you, and probably wonders how life would be if he comes back to the M.
Hope things start getting a new direction this year. Be cautious, don't have any expectations so it doesn't hurt. "I should be giving myself this advice".