really need help

i recently broke up with my boyfriend.we had a short relationship of two months but we had been best friends for about an year.the relationship ended as my friends accused him for cheating and there were enough proofs.we had a lot of mutual friends and he has lost contacts with all of them.but i still talk to him because recently he has resorted to drinking and taking drugs.he even attempted suicide.now i am not sure how true this is because i hardly believe what he says now a days but the reason i talk to him is because i think i am responsible for his downfall..even now when we talk he always says one thing that he never cheated on me and a part of me fall for his words. i know i should stop talking to him but i am just not able to gather enough courage to let him go completely and that is making my life very difficult. he is actually going through a very bad phase..he has lost his career,lost his friends and his health is also not quite well. a s he used to be a very dear friend of mine i am not completely able to break all contacts with him although these days he's been very rude.at one time he tells me that he wants me out of his life and the next moment he says that he still loves me and i mean the world to him..i don't know what to do..i am actually very confused because when i think of myself and the way he has insulted me and my self respect i just want to let him go completely but when i think of the situation he is in right now i don't feel like giving up on him and letting him suffer alone.. :sad:

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