I re-read this several times. I'm trying to learn from it since I have the same role as him as far as the relationship goes. Since I cheated on my wife (EA), I need to make sure I don't screw up her birthday, holidays, and our anniversary in any way from now until the end of my time.
As for your situation, he seems to feel very guilty and needs to let you know that he was a good boy and that he's being open and honest with you. On occasion, I feel the same way when I show my wife my phone contents (text, calls, emails) as if I'm proudly showing that I'm being a good boy. While is reassuring to me, it can go over like a lead balloon with her. It's me still feeling ashamed of what I did. Perhaps he is doing the same. I don't know.
I do know that I feel that I'm am not worthy of the same level of love from her that I had in the past, and that I don't want to behave as if nothing happened. These two things are huge weights that keep me from moving forward too fast, and the also make me move too slow. Maybe his mind is in the same place.
Again, I don't know.