My ex (18m) cheated on me (16f) but is faithful to his new partner. How do I stop feeling bad about this?

I fully admit I am not over my ex and I'm an emotional teenage girl, so maybe I'm just not thinking clearly.

My first relationship ended a little over a month ago when my boyfriend left me for another girl. While he cheated on me, I have pretty good reasons to think he's not cheating on her.

I don't want him back but that makes me feel worse. Because if he's cheating on her too, then you can write him off as a serial cheater, but if he only cheated in our relationship, then maybe there's something wrong with me. In fact, near the end of our relationship, around when he met her, we didn't have sex or anything for weeks, and when I learned he was seeing someone else, it actually hurt more that he was sexually monogamous, just with someone else. Because if he was just sleeping around, again this is an issue of him being greedy, but if it turns out he was capable of being monogamous, why not with me? Did he find me that repulsive? Is there something wrong with me?

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Tl;dr Ex is faithful with new partner, but he cheated on me. But this makes me feel worse because it shows that he's capable of being faithful, just not with me. It's not that he's a serial cheater, it's that there might be something wrong with me. Why was so undesirable that he managed to be faithful and honest with everyone but me?

Submitted January 01, 2021 at 03:06PM by ThrowRA-1919Y https://ift.tt/3o7p4Vz