Why cant I follow what my parents said??

Well I really like this guy but hes 4 years older then me(im 14 hes 18) hes a really nice guy, when we were dating he never dared to disrespect me and that shows a lot from him. Anyways we broke up due that my parents wont let me date until im 15 and older and more matture as they say. I agreed but I really like him and I asked my parents if I could at least be friends with him and they said no, because they think he’ll mess with my head since hes older. I agreed again but I’ve been talking to him in secret… I know im doing wrong but to me it seems really unfair…my best friends chats with him and he keeps on repeating to her how he feels about me but my friend tells him to get another girl and get lost.. In some point he should get another girl,but he says he’ll wait… Which he most likely wont… Were treating each other as friends but when I talk about another guy I know it kills him.. And when he talks about another chick it kills me but I pretend im happy for him =[ my 15th party is coming up and I asked my mom if he could be my dance partner and she agreed. But my dad wont let me =[ I told my ex if he wanted to be it and he said he would but he doesnt want problems with my parents,my ex also says hes trying the best to forget me but he cant (at least thats what he says) but I have this trust problem with people… I just dont trust people that much :( should I forget him??? I really like him I need help… Thanks a lot :(