Im always the rebound, never the girlfriend. How do I not feel ugly and hurt?

Anonymous
I dated a guy for a few months after he broke up with his girlfriend (lets calls her S). He and S dated for over a year, and I started dating him about 6 months after they broke up. It was super obvious he still had feelings for her. They remained best friends, and he was closer with her than he was with me. That's why we broke up. Fast forward a few weeks, he started dating another girls, and they've been together for TWO YEARS now. How can I stop myself from feeling hurt? Why was I his shitty rebound? Does it mean Im not pretty enough to be in a relationship?
Im always the rebound, never the girlfriend. How do I not feel ugly and hurt?
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