You can blame his behavior on him being an addict, but it doesn't really matter. Since you can't do the first thing about him being an addict, you have to accept him as he is.
You are worth more than that. So much more. You can love him all you like, but it won't make a difference. This is who he is and this is what being involved with him feels like. Love shouldn't hurt like that. Your feelings are just as important as your partner's in a real relationship. His feelings, his disrespectful behavior do not trump your right to be happy. He was and is apparently in a place where he cannot be a partner. He cannot care about your feelings. He is a broken person. You will get over him in time and find someone who can value you. It doesn't sound to me like he values anyone. He's too far up his own behind to care about anyone else's feelings. That is not something that you need in your life. You deserve better. Matter of fact, screw him for being such a jerk to you and his family! Get indignant about it...that might help. You will be much better off without him and his drama.