need some advice

So I'm thinking about leaving my partner who has a serious addiction to shag local groups and porn, I have a 1 year old and I'm pregnant😔 he has messaged a lass in the past when my daughter was born but he has not done it since but he's on pages and dating sites I can't deal with it anymore his work is more important then me and our kids he knows I'm depressed but he doesn't seem bothered he won't help, the only thing I'm scared of is I know I won't be able to provide for me and my kids as rent is so expensive where I live and I 100% will not be able to pay the rent I can't get a job as my child is too young for nursery and I'm pregnant what am I suppose to do I have no family or friends to support me and I know we will end up on the streets.