Separation😓

So Iv been married to my husband for about 5 1/2 years... Recently I found out he had an affair which this time (because this isn't the first time) I'm so over it... Same shit different female I'm not naïve nor stupid but I stayed in a situation for our children but I can no longer be a door mat nor a damn fool because that's what I look like... I recently decided to move out into my own place which will happen next month I told him I would never take him for child support but I'm gonna have to .... Just need some suggestions as to how I should do this because I will not be able to survive with just my income alone but he feels as tho he shouldn't have to pay because he takes care of our children without a doubt HELP!!!