I(18 F) need some relationship advice and some points of views of my ex bf (20M)

So, i have been with this guy for 3 years in total, we broke up for 8-9 months in 2023. but lets begin from the start, i liked him since i was like 10 and we were in the same school. then he left for highschool and i kinda forgot about him until june 2021 when he followed me on ig and texted me. before that he has been with another girl(i will call her May) so him and May been together for 2 years and from what he said it was his first love(even if he had more previous relationships before) and first serious relationship. everything was good (just so yk he was my first body) until he cheated on me with a girl AND HER COUSIN, even if he said he was using her cousin to get to her. after that i kept my distance and some other boy started trying to get my attention. while all of this was happening he was talking to a new girl(call her Paula, the one he was with for 8-9 months). we broke up because he chose her. after that, at the end of 2023 he hit me up thru tiktok, thru reposts and other bs. we started talking again and on new years eve we got back tg. things we re going on and off, and he still texted Paula and i wasnt really feeling like we were good. stupid me, i had a guy friend that he didnt know about, until he found out and made me stop talking to him. i didnt stop and did keep talking to him, he found out again and then i did it again and found out again. (very stupid of me and i really regret not respecting him) after that we ve been broken up for 1-2 months, but some guy texted me and i started to talk to him just from boredom. after that he found out about him because one of his girl friends talked to my bf while we were broken up. we still got back together after that, only for me to find out that since last summer when we were broken up he was texting his bsf(my cousin) about other girls from our city. he was talking how good they look, how he would fuck them, send pics of his ex May and told that she was a wound that never healed. Also, he told that i was a bitch and a whore but i still looked good asf, and breadcrumbed his other ex Paula telling her that he s waiting for her, that he loves her, wants her back and alot of other bs. all of these things happened while i was going over my head to prepare him a beautiful valentines gift(spend 3 days making a scrapbook, bought him a keychain for his car with a custom message, some of his fav snacks) and gave my last money to buy him a brand bracelet that i thought he would like. now he s telling me that he did it all to pump his ego and did it out of anger. he wants to get back together, he want to start over. theres 3 years of relationship tho.. but ik i will never get over what he did because i move on so hard from things that hurt me. is it okay to forgive him?