An interesting dilemma 3 months into a relationship. Not knowing your boyfriend's DOC - I would suggest that you do a whole lot of research about it and all of the consequences. Read the stickies in this forum. Keep asking questions.
Flower, made an interesting post look into the drug he relapsed on and what it could do to someone. I can not tell you to stay or leave cause everyone is different and really its your choice. But you could research as much as you can of his drug of choice.
One thing I wanted to point out to you about my situation, my boyfrien never stoled from me.. not once, never disapeared for days at a time. I always knew where he would be at, and never cheated on me. But back then I decided to stay with him and it has been up and down ever since. I am not saying it would be the same for you but it could be a possibility if you chosed to stay and you need to decide if you are open to that.
hugs and many prayers to you and your abf
Jewel