What do I do about my boyfriend?

He is abused by his parents and we’ve been going out for four years. Well every time we get in an argument he says bye and just leaves. I’m there for him as much as I can and do everything I can, but he just told me today that I’m only making it worse. He doesn’t open the door for me any more, says he loves me, asks how my day is, or how was work. And when I told him all this last night he said he was going to bed. I don’t want to lose him and I don’t know what to do