i met my now ex boyfriend in 2023 september, he was charming and nice,and i had really low self esteem so i immediately had feelings for him. in less than a month we shared our first kiss and everything was good. i did have my doubts about him earlier but i ignored my gut and went with it. (ps he was my first real boyfriend and my first kiss among other things). i trusted him and we got into a relationship, he was really immature but he told me he had a rough childhood and thats why he acts the way he does. i forgave him all the time for many big mistakes. i ended up losing my virginity to him in april 2024. i was only a kid, 16. he was older than me. he never used to post me, not even soft launching. i was really skeptical about it but i was very convinced that he loved me because apparently he was good at faking it. i broke up with him over a big fight in august 2024. i felt free and happy after our breakup but i did regret losing my virginity so early. he still texted me after the breakup telling me how he still loves me and he would wait for me his whole life. he told me he had gotten suicidal after the breakup and how he is going to kill himself but i sticked with my decision to not get back together. i felt guilty of breaking up with him.
but recently (in november 2024) i found out through a friend of a friend that he had a girlfriend since june 2023 to april 2024. he was with her even after we had sex.
i am filled with rage right now and i dont know what to do. i need revenge and i dont want to let this go. he had a girlfriend but he used to text her ex from 2022 too that he still loves her. he was playing three girls. both of them weren't physically involved with him but i was. i cant let him get away with this.
what should i do?