Just thought I would give a different perspective. In the days leading up to my Sep my W and I would talk in the middle of the night often (we still shared the same bed) and the conversation would be very surreal. We would talk about houses and places to live like we were going to stay together and be very upbeat, future oriented and then 15 minutes later she would ask if I found a place to live yet. This would happen quite often. I think it just goes to show how confused they are.
As far as your H wanting custody, here is a different take. If your H had very little interaction with your children and wasn't really involved in the day to day activities with them, then perhaps spending a few days alone with them, having to do everything for them, might be a real eye-opener to everything that is involved and possibly make him appreciate a little more of what you do. Your children are stil young enought where they need quite a bit of parental involvement for their basic needs (I know my twins turn 3 next week!). I would of course protect your self if you have to, perhaps something informal and not legal (i.e. H why don't you take care of the kids for the 4 days when you are off from work, I need a little break and I am going to visit some friends or something like that). Just some thoughts.
I know in my sitch, I typically did most of the stuff around the house (pick-up,laundry, groceries, take care of kids, and work full time). My W said she wanted space and we agreed to 50% custody (alternating weeks). All of her friends and family recommended that I let her drown in her space. I didn't let her drown, but I did let her struggle a bit before helping out....I think this was a good thing for both of us.
Just some thoughts
TwinDad Me 39, W 36, M 11 W - MLC, WAW???? 2 Kids B/G 3 YRS Old Start of the Long and Bumpy Road..... On the verge of piecing.....a new beginning