How to control feelings of?

smallpersonality
Jealousy? I don't want to care when the guy that I have a crush on pays attention to other women. We flirt with each other and extreme flirting involved. Anyway we have new manager and he basically treated her the way he treats me. He kind of hurt my feelings, especially because this all occurred in face. I want to learn how not to care anymore about what he does. I want to not get jealous and continue on enjoying my days at work. I would appreciate any advice.
Updates:
+1 y
HighlanderTheOne, he is not a manager. He is just an employee like me. It's our manager (his and mine) that he was flirting with.
How to control feelings of?
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