I'm so sorry you are going through this, sweetheart. You deserve so much better. Your story is not unusual. There are many people here who are in relationships with addicts, who keep giving them the benefit of the doubt and hoping that there is something they can do or say that will make their addict snap to attention and realize what they are doing to themselves. Unfortunately, that rarely happens.
As I said, you deserve so much more than what you are getting from this relationship. I hope you will continue to come here and post and read the stories of others who are going through, or have gone through the same things. You will find so much support here. There is nothing you can do for your boyfriend, but there is much you can do for yourself and we will help you in any way we can. You are not alone.