How can i have him back?

So.. I like this guy, his so damn hot and handsome.. I even paid 50 euro to go to a concert and meet him..After the concert, i found out that he was saying to others that i was ugly and a geek. To revenge myself i went and kissed him. I said that I liked him and then that I just kissed him, of course i ended running away.. He said that he didn't like my kiss because he loves another girl, but that girl does'n want him. After a while a got together with another boy, think i could forget him but it didn't work neither my new relationship neither did the forgeting part.. Now he desn't even says Hi to me.. Hou could I be with him? speak with him or don't know something? ^_^ Thanks!