Welcome to SR! There is a lot of great information for you to read that will help you answer many of your questions. Please read the stickies at the top of the board.
Your bf's one and true love is his addiction. Plain and simple. If left untreated, it will progress beyond your wildest nightmares. I know, my husband became addicted to pain killers too. During his active addiction, the once loving, honest man I married had become a lying, manipulative, selfish jerk. It's part of the disease. They will lie blame, manipulate, deflect, steal, deny - all too protect and sustain their addiction.
Love has nothing to do with addiction, if it did - none of would be here. Keep reading and posting. it will help!