Can anyone help??plz answer?

okay so theres this guy that i really LOVED. he use to like this other girl thats my bff.then he turned out likeing me,we dated and then wen we where dating he was flirting with her in front of me! i broke up with him and then few months later we go into a friend ship fight,and after that we nevered talk.5 months later we where not in the same cl...we talked alittle but he doesnt play with us anymore.he plays with these people who he use to hate.he told me that he doesnt chill with us is because of hilary,the girl he flirted with in front of me. they hate each other now.all this time i keep on saying i dont know who i like.i want to like someone,but i dont know how.till now i think i still like him... how can i come closer to him?then be like his best friend?