How do you begin to re-build your relationship with your partner?

My husband and I have been fighting for months now and have talked (or more like yelled) about splitting up a few times. We do want things to work out and we want our son to be happy. How do you put stupid little things behind you and become happy again? We argue over the stupid things. I mainly get upset because I feel like I do all the housework, cooking, taking care of the baby, while he gets to go out and do whatever he wants. Things will get better for a few days and then its back to him calling me stupid and ugly and me call him a lazy d*ck. How can we save yourselves the heartache and work things out