What should I do with my crush?

There is a girl in university I'm here crush and she is my crush as well but she is my friend crush also the problem is he isn't serious just looking for fun... my problem is I am afraid to be in relationship again cause of all my bad experiences before I'm really very afraid from discovering the real personality after time... today he is thinking to talk with her I felt jealous I am 100% sure she is gonna refuse him or use him to reach me and both options effect me in a bad way, so I don't know what should I do !
Should I talk to her?
Vote A
Let her go?
Vote B
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What should I do with my crush?
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