Shouldnt i have a right to be mad?

Me and this guy from school we started we have known eachother for a few months and we started talking and he would always flirt with me all the time but I thought it was just for play and everybody knew he liked me until he kissed me one day unexpectly but i liked it.We started texting eachother all the time and we chilled a few times.One day we chilled like anyother regular time but we had sex and It was my first time and like after we were all jokeing around and just hanging out.Well we still countined to talk everyday until one day I said we should chill and he said we will see cause i might be dating someone..I was crushed after I just gave it up and now he is gone. We had like a little argument i felt like i got played i trusted this boy through everything.He was like trust me i didnt play you,I havent broke your trust and we wasent dating and you knew that and how i was the first out of all the virginty he took to complain like this!!!!!..Now latley ive been seeing him around with his gf and i hate how he tries to rub it in my face and he lookes at me like im a comlplete stranger..but the only thing i can do is to ignore it and move on with my life but its still hard..like a few weeks back i ased him to be honest with me and i said why do we seem to act like nothing happend between us and he was like im not hurting you or trying to!!!:/ Just cause we werent dating shouldnt i have a right to say something to stand up for myself??? Shouldnt i have a right to be mad?? If i wanted to talk to him what should i say??? I totaly regret this whole situation!!!!!