Guy's Behavior

How can I become the best form of myself?

hi!!! i have a lot of resentment and anger towards my boyfriend. last year in October he went out with his friends to eat dinner and two girls sat in their table. the two girls knew one of the guys there and they decided to sit right next to Walter (my boyfriend) they all started talking, exchanged instagrams,. he didn’t tell me anything. i noticed he these girls following him so i asked if he knew them, he said no. fast forward to November i decided to go on the girls page and look at her stories. low and behold, she posted a picture on her stories of them three and tagged “the extras at the table” i let days go by and decided to ask walter wth was up. he said sorry he didn't want to tell me anything because he didn't want to hurt my feelings and he knew how i would react. he said he wouldn't do it again so i believed him. however i can’t let go of the situation. i talk to him about it every single day and he says the same thing: those two girls sat at our table, nothing was going to come out of it” he promised he wouldn’t do it again. fast forward to two weeks ago. he has a best friend who i truly do not like as a person. he is very much single so he hangs out with girls all the time and guess who he calls to tag along? yup you guessed right, Walter. two weeks ago i decided to look at his friends stories because that guy posts everything!!! what do i come to find? a picture he posted in his stories of him, walter and a girl name Naesha. naesha is suoeerrrrr slutty. like i mean showing her boobs, almost her nips coming out, wearing leather pants and post herself in lingerie on facebook and instagram. i hung out with him the next day it happened, he didn’t say anything. when i saw the picture, i called walter and i asked what was up he said ge was sorry, he didn’t know she was there he was only there for his friend and to drink one beer and he left.
Updates
10 mo
i said “if your friend didn’t post that picture you wouldn’t have told me” he said he would have but i doubt it. we have not been good for two weeks.
Updates
10 mo
every time we talk it’s always fighting. yesterday we were hanging out fine than the thoughts come to me so i talked about it and he got upset. i’ve barely look at him anymore. i will but not as much i used to. he told me yesterday “pls look at me i’ve noticed you can’t look at me anymore” i looked at him and he said “don’t look at me with hatred”
How can I become the best form of myself?
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