It sounds like you're on the Piecing Roller Coaster. The inconsistency would wear me out as well. That's good that he's making an effort with your kids but I think you have to employ some extra degree of patience as the newness of the baby starts to wear off.
It sounds like if you start pushing too much that you may push him right out the door again. You got to revert to some old mindsets of play it cool with the understanding at some point it will start to filter out with regards to his feelings and intentions about the future.
You got to remain strong for your own well-being right now. That's an empty space to occupy but it's probably the only thing that will work.....if you want it to work out long term.
My WAW's birthday is this Sunday and I'm resigned to not sending her a card but part of me wants to but I'm thinking that it's best to act as if I've moved on with the situation. I know that some of her girlfriends are taking her out on Saturday, so she'll have stuff to do but I doubt if she'd even acknowledge a card from me either way.
Special occasions are tough and I'm having to prep myself for the reality of holidays being spent alone without her for the first time in 10 years. Not fun but that time of the year is coming whether I like it or not.
Hang in there and be patient with things, I know it's tough.
Me: 42 WAW: 37 Kids: 0 Separated: 06APR13 M:7 Years, T:10 years WAW states she wants to "move on": 01JUL13 "Courage is the standing army of the soul which keeps it from conquest, pillage, & slavery."