in his addict/user mind you are really just a Motel 6....a place to go after the "fun" is over, to crash, shower, eat and rest up for the next run. he isn't running to you like a lost little boy finding his way home.....he hits you up cuz you let him in. trust me, you are NOT the only option....
somehow you went from loving a man, or the man you thought you knew, into making yourself responsible for his well being. you are not. it is not your job, it never was your job.
you HAVE to put the baby first. his dad may be a flake, uncaring, unconcerned, but his MOM loves him and wants only the best for him, and will move heaven and earth to provide him with a safe happy life.