Really bad problem with love life?

okay so i liked this guy sence the frist day i met him and that was in 2010 in april. this guy became friends with me in august 2010 and we shared a class and we flirted alot then he got a girlfriend and i Still liked then they broke up and i was his shoulder to cry on and later he got a new one who lived down the street from me and one day he went over to her house and came up to my house to hang out with me the whole time. and a week later they were over. then he was single fopr a LONGGG time and a few days ago he asked out a girl and he doesnt hang around with her cause he HATES her friend but during all of this me and him flirted with eacth other even when he dated a new person. oh and toi top it of...my best friend ever fell in love with him i just need help...