How to keep oneself busy intentionally just to forget the past? wont it remind d past u r trying to forget?

I have a boy friend who was best friend before.But nowadays cant understand him at al.He will be fine one day and the other day he wil tel that we are just friends and nothing more. but now he has completely stopped talking to me when i approach him he will avoid me. I thought let me also forget him n move on and am trying to get myself busy in some things.But am not able to come out of it. I have to see him everyday in college and everything reminds me of him. Please tell me how to get over him. I am not finding any way cox i love him a lot.