What does it mean if a girl says “you are sincere”?

Anonymous

There is a girl i have a crush on and i get nervous around her and she asked me why i get nervous. I told her “i dont know” because i didn't know what to say.

she then told me “do you feel nervous around girls? Dont you have a girlfriend?” I said no.

and then later on she said “you are sincere”.

What does it mean if a girl says “you are sincere”?
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