DB713, Yes, He seems quite concerned about the OW. Has he written you again as promised?
His unwillingness to focus on your sons or the situation may not have anything to do with his lack of feeling for you. Some people have a hard time dealing with tough emotional issues. Your ex might be one of them. In the meantime though, don't sit around waiting for him to be more expressive. Keep moving on with things. If he comes around, you'll know it, but I'd hate to think that you're stopping your life in the hopes that he'll be more attentive. Don't do that! You've got a bigger job to do now. Focus on that for a while.
Keep posting on this board too. We're with you. Michele