Husband vent!!!

Okay. I have been with my husband for 5 years and have been married 3. We both have children outside the relationship. His son was one when we got together and my son was 5 months. He has been the only father figure in my son's life. Since day one, he has placed all responsibility of his son on me. As far as discipline, clothes, babysitting (even when he didn't have a job & was just out running), etc. I've been okay with taking on some responsibility becuase we were joining families. Fast forward to now when we have a total of 4 children & 1 one the way he is USELESS. he wont deal with his child's mother. I have to do the pick ups and just recently I refused to do drop offs. If there is paper work that needs to be exchanged I do that as well. I literally mediate all fights. Now, it's to the point that he won't even help with the children that live with us full time. He has to be told every little thing to do otherwise he just sits there on Facebook or zoned out not helping. He has even stopped picking up after himself. I'm literally about to just be done with this. I've tried talking to him and nothing happens. He says he is sorry but given the first opportunity to change he does the same old thing. There was one occasion that he forgot to feed them, but fed himself. I keep thinking with one more on the way, things are going to be more difficult. He just won't help with them.

Another thing is, my car has been messing up for months. This cars runs his errands, takes the children to school and doctors appointments, does everything. He wouldn't fix it. He let it get to the point that the engine needed repaired and I had to curse him out for him to do anything about it. The second his truck breaks down he is out there working endlessly to fix it. I had a bad tire and told him I needed a different one & he said I'm not spending 500 on tires. I have always bought used tires. They are like 30 bucks. He gets new tires for his truck. I just feel like this whole marriage is all about him. I'm just here to take care of the kids and clean up the messes. I feel so depressed & stressed. We are 6 weeks away from due date and I jusy don't see how this could work.