I loved a boy who is my family friend we are just friends about 1.5yr I'm wating for him when he will propose me... & we also dating once in a month... & we daily chat at night he is vry innocent guy & I'm vry talkative I asked many time "did u hav girl frnd he said no. then why did u do so" he says I didn't found yet... then one day I came to know that he is getting married I'm get depressed I thought when my exams get over I will definitely propose him, after my exams I came to know that he have a girlfrnd from a year ago. I get depressed & after a days I call him & asking for the truth. But he was lying to me, then at night he told me the truth on sms. He feels sorry for me but I didn't forgive him... I really hate him a lot... but I missed him soooo. I'm trying to forget him. But I fail to do so... what to do I can't understand... please suggest me..

You get over it!
That is the only think you can do. He has a girlfriend, he has never given you any indication that he wanted to be your boyfriend. This is a fantasy of your making.
It is time to wake up and grow up. Don't waste anymore time on this guy. Focus on school and other things.