Thinking about actions rather than words ml is a pretty major thing, especially considering his issues. I see it as a good, slightly bigger than baby, step. He is probably really confused right now, after all he has been telling himself for a while now that he doesn't want you - suddenly he finds he actually does.
After having to stop do you think he is feeling inadequate? Can you build up his feeling of adequacy? Reward good behaviour, don't make a big deal of it but I would let him know you were satisfied and that he was good, if you know what I mean