Good luck hun, it is difficult bringing up three children on your own but it's a lot simpler and hassle free then your life sounds at the moment. You said you care about what happens and want to help him - well by making this decision to seperate you probably ARE helping him. You're taking a stand and not enabling his behaviour anymore.

Maybe this will wake him up and see things in a different light? Maybe it won't but you need to think about you and your kids.

Do you have friends/family around that can help you?

Good luck hun