How can I forget him?

I don't understand what do you mean by writing that you were harassed. You said you met him and you are in love with him. Was he too in love with you. Time is solution to all problems. If you cannot forget him, then keep remembering him, and as the days will past and you will not have any communication with him, slowly slowly you will find that you are getting used to this new situation of living without him. As more and more time will pass you will have no other choice but to forget him. Life has to continue so we have to forget past and continue.....give yourself some time and soon you will forget him. And if he is honestly in love with you, he will come back and if he does not then it is better to forget him.