Get Laid Tips

I have know this guy for 3 months now we have been dating for a month, every seems like it will go well, he is nice, he calls me everyday we see each other twice a week we have not had sex only kissed, he has told me that he really really likes me, and he just seems like he would be the perfect boyfriend.
However i have know my bestfriend/f**k buddy for 2 and a half years and i can talk to him about anything and he confides and always tells me his problems, but we are only F**k buddys and he has always made it clear that thats the way it will always be and nothing ever more because i dated his friend before, we both love each other and he always tells me he wishes things were different but they are not, he doesnt want me to talk to any other guys or have a boyfriend all he wants is for me and him to be f*** buddys untill he gets married or has a gf,
he knows that i am seeing the guy that i have know for 3 months and now he doesnt want to just be friends with me without being f*** buddys so either i chose my potential boyfriend or him, but i love my f** buddy and i can tell him anything he is like my bestfriend and im like his, but now that i told him i dont wana have sex with him anymore, he is saying that he doesnt want to be in my life anymore. he doesnt wana talk to me on the phone and never see me ( we talk everyday about 6 times a day)
yesterday he cried on the phone to me saying that im really hurting him and doesnt understand how i can throw away 2and a half years away.
what do i do i dont wana have sex with him cause im seeing the perfect guy who i think would do anything for me and he doesnt deserve to be lied to or cheated on but what if it doesnt work between me and my potential bf and i lose my bestfriend/f*** buddy too?
what should i tell my bestfriend/fuck buddy that well make him still be my friend and nothing else, what should i do about the whole situation !!!
i am 23 my f*** buddy is 27 and my potienal bf is 24