talk some sense into me please

We broke up for two months. He met a 23 year old girl on tinder and they texted for about a month. Pretty sure sexual pictures were sent. They never hung out in person though. This girl is young, tiny, tan. I'm not fat (118-120 pounds) but I have cellulite, I'm pale lol and I'm 27. This is really messing with my head and I feel like I'm not good enough. Or he's comparing me. He's the one that came back and wanted to work things out after he compel felt shattered me. I'm trying to move past all of this but it's really hurting me. I'm sure he only talked to her to "move on". Any advice? You can be mean lol I really need a kick in the ass