Feeling Stuck

I'm not happy in my relationship any longer & acting like I am is becoming difficult. We have 2 kids together & he's a good dad but if we break up he wouldn't be able to see them as much. He doesn't have his own car or even a place to go so I'd have to be the one to drive my babies wherever he is. This is why I'm afraid to break up with him.. I don't want to take the kids away from him. Advice or idk what I'm looking for at this point.. :/