Why dosnt this girl like me/?

ive done everything ive been so nice to her done everythiing i could to make her happy iv written a song for her 2 poems and there wernt sucky ones eather i get shen dosnt like me why all her friends say im cute and sweet and there jelous of me liking her but she keeps liking this effin doosh bag that talks about her behind he rback when they were dating and called her a and i beat the hell out of hhim for it and she got mad i had what he said recorded im not trying to be an a hole and keep her from who she wants but i love her so much i feel like killing my self a lot even my freaking email says it but im not obsessed with her i love her so much ive tryed to get over her but it seems impossible this super hot chick asked me out that every single person i know would rather date than this girl but i went what hell no i think shes perfect shes so sweet and beuatiful but i just dont get it i get so mad cuz she liked that guy that said stuff about her she makes me so happy but also so sad at the same time