I had a friend who...?

was a guy and i liked him alot and i mean ALOT. only he had a girl friend... he would aways seem to flirt with me and i would flirt back because i hated his girlfriend... she was a major bi&#* and would quite literaly ruin ppls highschool lifes... ex. she made a rumor about one of my friends that she was born as a guy and had a change... helll nooo she did not have a change!! anyway... i found out that she was cheating on him cause i found her making out with another guy... i told the guy i liked about it and he said i was just making it up and SHE tried to defend herself by saying that i only said that stuff because i liked him... and of course he believed that hag from hell and the whole school besides my friends thought that i was making it up.... (anyway long story short.. to late) he stopped talking to me and became extremly angry and embarred about me liking him and telling him about his girlfriend... now two years later they broke up because he caught her cheating on him... (big surprise.. i mean duh!) and i still think that i like him and i feel bad about telling him about his girlfriend in the first place becuase it made him mad at me even tho i think it was right to tell him... what should i do to get the guilt off my chest and to get over him?? HELP?!?!?