how to forget people who have wronged you

kind of seeking advice in a way and also just coming on here to talk. i always come across peoples experiences saying that their first love never leaves their mind & they always remember them in some shape or form. obviously this doesn’t speak for everybody, me and my ex stopped speaking around 4 months ago due to a situation where he was talking to another girl while also meeting up with me throughout the summer. before that we were on and off for around a year or so. i loved him a lot but he put me through immense pain and always apologized to the point it felt insincere. i keep on having dreams about him. this was my first boyfriend and we shared everything together, and he meant so much to me, still does in a way. before i cut him off, we decided to end our farewell on a good note and sit and talk to one another. it was definitely emotional and i think that was the first time i saw him cry ever. i know that i loved him because every part of him is grained into my memory and also my heart at some point. he was my first love, but with everything he’s done to me throughout the entirety of our relationship, i know that i don’t plan on reaching out to him soon or speaking to him again. i honestly just want to heal in some way or remove him from my memory completely but that’s easier said than done. in some odd way, i crave the comfort he gave me some nights. we used to lay under his sheets and hold eachother close, as much as i miss that, i would never hope for the suffering i went through due to his actions again. missing the memories can feel bittersweet at times but for the most part they make me cry, i hope one day i can look back at them with a warmth inside my heart rather than hurt and pain. i think its safe to say i miss him and the memories