I know it hurts for him to move out, but it sounds like you need the space from him right now. You are right that they seem to be getting closer, but surely they will get on each other's nerves. The age difference is so big. I cannot imagine myself at 19 wanting to be with a 38 year old man. I was having too much fun being young.
It's so hard to take care of the kids when you are a basket case, take this time away from him to do things for yourself and the kids. My girls are teens, but I hate being upset in front of them.
Life's challenges are not supposed to paralyze you, they're supposed to help you discover who you are. -- Bernice Johnson Reagon