How to deal with guilt?

i'm 24.. six years ago, i broke my bestfriend's trust, i acknowledge my mistake, we didn't stop talking then, we kept being friends for about two months, and he just distanced himself although i tried to repair our friendship by going over his house but i'd feel he is just ignoring me, it doesn't help that we have different interests now and different friends with different interests... but i still feel or at least think that big part of it is because of my mistake. i feel guilty. yesterday it really got to me and i cried myself to sleep, i won't be able to forgive myself. how can i move on?