Boy Problems! Killin meh! Just need to get over him....?

i have liked this guy for three years. the first year i met him, he sorta liked me but just as a friend but barely. and when i asled him out, he said yes and then broke up with me an hour and a half later. ): so then the second year of bein friends, it was a mixture of hating and liking one another. this year, he went out with my best friend. we even had an agreement that no matter who he chooses, we will still be friends. and so i asked him out again this year cuz we have grown rly close and in my opinion all we do is flirt back and forth! i think he sends me mixed signals! cuz he said he wasnt ready for a relationship, but that was a nice way of letting me down. so then i continued to like him but he didnt completely understand that im head over heels in love with him! whenever i talk about him, i get erflies and i just light up. so then my friend tried convincing him into kissin me on the cheek and lettin me down real easy. well i walked away and he said no. so then i called him and i told him that i loved him that same day and he just said that he just wanted to be friends cuz to him i am that friend that he only likes talking and laughing with. it really hurt me. all year this year my friends have told me that i need to get over him cuz they think he is gonna REALLY hurt me if i continue this. i would, but with feelings so strong for someone so perfect in my eyes, how can i? i just need some help. im tired of getting frustrated and crying at the fact that he still likes my friend and that he doesnt like me. i cant stand any more heartbreak. today was my bday and he was all nice to me at first and then started snuggling and hugging my friend. it really hurt and i couldnt believe that she would do that when i was right there. wat do i do?