Lying, drugs, and everything you can think of?

okay, so iv ben with my boyfriend dewayne for 8 mos now...and everything was perfect in the begining, then we both started using IV drugs, heroin, crack, cocain, and narcotics, and it was destroying my life, so with no rehab and just will, i quit : ) dewayne got REALLY bad..and he started lying, goin behind my back, and everrything you could think of....except cheating : ) and he said he was guna quit, and today he went to the methadone clinc and is gettn help startn monday, and since all this has happend, its hard for me to trust him, and weve ben arguing NON stop, and i wanna leave, but i dont wanna give up on him. i want to be with him, i love em so much, its crazy, i need advice on how to deal with him recovering..hes still using his needles : ( and still lying....what the hell do i do?