New single mom

Still living with the husband since we have a lease at the apt, but I’m hoping he’ll move out and help pay the rent or I’m gonna move in with my parents. We have a baby son, 11 months old. I have my cat and dog. I’ve tried working things out with him, forgave him the first time he cheated. He did it again of course so this time I’m done. I would appreciate any advice. I know nothing about divorce.