What should I do with my boyfriend

I had a boyfriend for last 4 months,,he and I were net friends then we talked on mobile and then we met, he was very friendly in the beginning but gradually he started ignoring me and he used to say that he is busy thats why he cant contact me.,. I am too tensed ,,he frst showed his feelings to me and then I also started feeling for him..he kissed me everywhere when we met for the second time..but from last 2 and a half months he doesnt talk to me,,I have asked him for many times but he always said that he is busy…while I chekd that he used to reply all on net but he never replied me.,,, he used to talk to my friend on cell ..but he didnt talk to me first,,… And now 12 days have passed I didnt talk to him .and he ,,as usual he didnt text me or call me,,he has totally forgoten me.,..n I still coudlnt figure out the reason,.n now I m also giving up as his behaviour is very rude..and indiffernt with me … Tell me what should I do?