advice 😐

So my last relationship was so bad in every way possible, it always involved girls. Him talking to girls i clearly didn't want him talking to behind my back & just every argument was over girls. My now SO has a past like everyone else, in January 2 of his ex's sorta reached out to him. The first one msged him asking him if he had called her private because it sounded like him. He told her so much shyt as in he was happy now to leave him alone & that her number been blocked from his phone. She replied with "gosh i was just asking, love you" of course i got madddd. Two days later or so his other ex that cheated on him requested him & it got me mad again because the first girl anger was still so recent it made me mad again. Now like a month ago, one of the girls he used to talk to & somewhat had a thing with requested him but he didn't approved it he just let me know that she had requested him. Last night that same girl, goes & requests me🙄 i have a picture with my SO so im pretty sure she recognized me & requested me just to be nosy. All this girls from his past somehow coming back to our present makes me feel so eh, & i grow distant from him. Idk if it's because of my past relationship what has me like this now. I know it's not fair but idk what to do to help it. I've been with my SO for 1 year & 5 months. Has anyone been in this situation or what advice would u give a friend?