Should i give up on this boy?

Me and him were best friends. and then he liked this girl but she was messing with his head i told him that but he didn't listen and when he got hurt i was there for him. now he kept talking to that girl and now there really good friends. i developed a crush on him but i got into a fight with that girl and he took her side. and when i told HIM i liked him he told me to get over it. the next day he apologized. but then he didn't want me i.m-ing him so he created a new s/n only he that girl and his guy best friend knew. now his guy best friend told me but not the s./n so my sister hacked her s.n and got the new s.n he made and then me and him were talking and he made me cry so she i.m.ed him [my sister] cursing him out, he found out we hacked her and now not only are me and him total enemies but now hee talks mad **** about me. i cant get him off my mind but idk what to do....get over him or keep trying??