plz wat should i do?

i really need some advise right now! me and this guy are really close friends and like ppl say u can never be "just" friends with the opposite sex right?well thats true! my friends are always tellin me that they think i've fallin for him just that i havent relized yet because at that time my heart was to someone else. but now its all different! i've fallin hard for this guy and alll my friends seem to think he really likes me and some part of me thought so to cuz he cared if i was mad at him or not! but i went and did somethin stupid! i got him with my bestest friend ever and now it hurt me whenever i see them hugging and kissing! and i end up cryin everynight since the day they got 2gether! my friend doesnt no about any of this tho cuz if she did she would break up w/him!but she has been through many hurt and im just happy she's happy!its funny though i did this many of times b4 with other guys and it never bothered me but now its all different! maybe thats because he is the first guy im really close with and is comfortable around! i thought i can just forget but then they told me that they did it and it really hurt me so bad you cant imagine!he does know that i like him though! but now i have decided to not talk 2 him no more! im gonna move in a few months so i decided that we shall never talk again but it bring me to tears thinkin about that but i cant even look at him straight in the eye anymore because it makes me remember what he have done and i just want to break down!!but it also makes me break down wen i think bout our happy days!! what should i do?