Bea, I'm not surprised by the silence. I've seen this happen many times over. They come out, profess that they want a relationship w/the family and then poof! Back in the rabbit hole. He got his ego kibbles for a bit when you were posting to him and meeting up w/him to discuss things and to listen to what he had to say. In his mind, he thinks you are right where he left you and you'll be there no matter what to help him w/his sons, if need be. Unfortunately, he doesn't realize that you've been moving forward for a long time.
He'll contact you again when he's having another moment of clarity. His coming out of the rabbit hole was just to see if you were still there.
Take care of yourself.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.