Should I leave my alcoholic/addict boyfriend?

I have been with my boyfriend for 1.5 years. We have been best friends since the 3rd grade. He has a history of Meth addiction, but went to rehab and hasn't touched it since. Throughout our relationship his drinking has gotten worse. He drinks every night till he is black out drunk in order to sleep. He tells me he wants help. So, we came to the agreement he would not drink hard alcohol Monday through Thursday. However, he could drink beer and wine on those days. He has not been able to accomplish this goal for the past year. He has given me every excuse and argument of why this is ok. He states he is a grown man in his own apartment, and I need to stop ruining his good time. I finally left because I realized this was way out of my control. He begged for me back and said he would get rehab. However, He claims there is a waiting list for the rehab. Meanwhile I have waited for almost two months now and he has only gotten worse. During our break, he got himself a marijuana license and started smoking weed on a regular basis. I asked him to throw away the marijuana license and he refuses. Now his ex-girlfriend that he used to smoke meth with is conveniently back in his life but claims it is just platonic. What do I do? He claims he wants a future with me, but my instincts say I am getting played. Help?