I am in a relationship that I dont want how do I get out and still let him in his childs life?

I have been with this guy for 3 yrs, and all he has done is steal to provide and lie to me and use drugs and would keep telling me that he will change and stop all the crap and maintain a job and tell the truth. He feels that since I moved up to my sisters house, that I think that I am better than he is and being cold hearted about his now homeless situation. I do love him but he really needs help and needs to learn to stand on his own 2 feet. He had broke up with me in the begininng of our relationship because I was depending on him, but I was in a shelter and we had an agreement that we would get our own place and he just dip out on me. Now the shoe is on the other foot and he thinks that I planned it that way. I moved to be in a better neighborhood and and start a better life for my 10mth old, and he can't see the that. He is homeless because he stole from his job and lost our apt. and blames me the whole way. he said he'll get help to get me and son back.Iwant him to go for hisself