Friendship gone sour - how to lose a friend

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Is it me or is it him? I have this dilemma for a year now. I lost a friend to a girl, cigarettes and booze. I guess everyone has experienced this kind of feeling. I am hurt not because I am jealous and not because I am interested in him romantically but because I consider it a betrayal to leave a friend for those things. We were really close buddies: we shared stories, we listened to each other and gave advice, joked and fooled around, laugh and cried together. Until he decided to pursue this girl about a year ago. I actually encouraged him to go for her because I though it would be a good match and he really was in love with her. But then, that might have been one of my biggest mistakes. He started changing. He smokes even if we promised we wouldn't because we agreed on its disadvantages and we really hated the smell. He drinks and its drinking to the max, meaning he can't even drive himself home. He had been in accidents because of this behavior. He gets home really late or really early, depending on how you look at it (5 am onwards) because of partying. He cheats during exams because he didn't review for them and partied instead. He became the worst freeloader, using other people to gain credit, making excuses not to help. He changed and he was no longer the person I knew. He apologized a couple of times but I still resent him. He's no longer the reliable, responsible and fun friend that I knew. I still couldn't talk to him except for hello's and hi's in the hallway. We haven't had any sincere conversation ever since he started to hang-out with those people. Am I the one lacking? Or is this the real him and I was just deceived with our friendship? Is it me or is it him?