What do i do????

ok so my bff was going out with this guy 1 year a go and then he dumped her for me so stupid me i said yes then she hated me so i broke up with him{even though i liked him}and then 3 wekks later she noticed us flirting and with out my recongnition she got us back together there was only was 6 days of school left soi went along with it and then the summer came and i did not here from here all sommer then when school started he was in my homeroom!!! and so we were still going out and now he broke up with me for no reason he would not tell me and now it feels like my heart is broken and i just cant to seem to get him out of my head and there is a dance this friday and i really miss him!!!!!!!!!!!!!!!