Broken hearted dont want to accept its over, help!?

Last week my boyfriend dumped me, we had a heated argument about nothing outside his flat and he said he never wants to see me again. We have an on off relationship, but we make a cute couple we are affectionate and have lots of chemistry, however, when i get overly emotional he walks off whether it be saying he wants his space or dumps me. this time it has been ten days and he hasnt come back, he says it wont work, i hate your behaviour. I keep hoping he will come back as he told me to leave him alone for three weeks....but this is killing me as all i do is think about him, i dont want to go and see friends and i just cant let go. I feel that he feels the same but there are no signs to prove this, in fact the opposite. I just feel like im driving myself mad and i dont know what to do. i keep saying im sorry, i need to learn to be a calmer person, i miss you come and hang out and he just says no. Help.