Child support isn't for you. It's for the care and support of the children.
You don't deserve child support, the children deserve it.
You, as the mom, will have little control, if any, over how he chooses to be a parent. So, you can either come up with a way to cope with the upcoming situation or you can do what my mom did: spend 15 years in and out of court with dad, unintentionally poison the relationships between children and parents and generally make a huge irreparable mess of things. You choose, because he's there to stay.

