i try to get over that person..

Me and a friend (whom i liked) were really close. But now my friend hates me, but i still like them. i try and tell myself i am over them and that i have moved on. but every time i see that person, or see a picture of that person I immediately snap into depression mode, Because i miss them, but i know there is little to no chance that they will ever forgive me. i don't know what to do and i am so confused