libby, Is this new behavior for him? If so, how long has he been doing it? The reason that I'm asking is that he could very well be having moments of clarity/sanity and will dive back into the "fog" after a while.
In many cases, they come home and say that they want to work on the marriage and become this flirty, clingy, attention wanting person for a while and then back into the hole they go again. Accept him for who he is right now and if he's pleasant and wants to do things w/you, go ahead and do them...just keep your expectations at zero. He's emotionally all over the place and until he settles down, you really will not know which way he's going to go next.
You have a good handle on what MLC is all about and you have your hands full being a mother and also a "mother" to your man/child right now.
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.