Boyfriend doesnt ever want to see me....?

He will not break up with me. He says he loves me but he treats me like crap. I take care of his finances (paying his bills, etc. with his money) I wash his clothes, I cook for him, I clean his and my house but his friend has been staying the night with him every night this week and he says he doesnt want to see me and we fight constantly because of it and he hangs up on me at least 5 times a day. He is 24 years old and I am 21. I want to see him all the time but alls we ever do is argue. Why is he keeping me around. I dont want to break up with him but Im getting tired of playing second fiddle. He also has a child that I help him take care of. What should I do?