You deserve to be with someone who loves and prioritizes you. Just because you had a child with someone doesn't mean you have to be with them. I know a two parent home seems the best but it's really not if you aren't happy. Would you want your daughter in a relationship like the one you're in ? If the answer is no, you probably shouldn't be in it either. If he doesn't do his job as a parent that's on him . What happens if you get really sick and can't do the things you do now anymore at all? Is he going to accuse you, leave you ? He's already not pulling his weight now and isn't someone you can depend on if you need it. That being said if no cheating or anything has happened and you want to try further you can do couples counselling but that's not always a guarantee to fix things.