I cant seem to forget and forgive?and I need to learn HOW?

me and my bf have been going through so many trust issues and i wish there was a way to erase all these things from my memories so i can trust him and look at him the way i did when i first met him i was infatuated by him and just has my heart but he has done somethings to make me not trust him and look at him differently and i want to be able to let everything go but it seems as though i cant so what can i do?