Is it bad that I gain those pounds back?

Ok I dated this guy and I losed five pounds for him so I weighed 120 pounds and I'm 15 years old so is it wrong of me to pig out and gain that weight back because he got back with his ex when he was still with me and he dumped me two days after because he couldn't decide who he wants dto be with and he says he still loves me?
Is it bad that I gain those pounds back?
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