Is it bad that I am obsessed with getting back at my ex?

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My ex left me after we were having a bad patch
The guy she left me for told her how horrible of a person I was and she even told me all that
She later shoved her sex life in my face

It has been 5 months and everyday I think about it. I have lost weight and gained muscle. I am applying to med schools. I am just wanting to prove her so wrong and become super successful

Is this a bad way to approach this or is this an obsession?
Is it bad that I am obsessed with getting back at my ex?
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