How to overcome insecurity on looks?

- A girl showed a lot of interest in me.
- Another guy flirted with her.
- She bounced over to him.
- Other people commented that he is very handsome.
- I became insecure about my looks as a result of that.
- Feels like women can just walk out on you at any time when a better-looking guy comes along.

How do you guys overcome insecurity about looks? Especially when you know there will always be more attractive people. I never had such insecurity until this happened...

How to overcome insecurity on looks?
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