I rejected her once, but overtime I realized that I love her and I will do everything to get her back. Help?

I don't know what to do. I can't sleep nights and I can't eat. I can't have one productive day without thinking about her. I never expected to fall in love. But I will do everything for her.

She seems to flirt back and tells me to call her but sometimes she just goes blank and I don't hear from her. It hurts me so much and I want it to stop.

I thought maybe I should tell her what I feel and just see what she says? Female advice please. Thanks.
I rejected her once, but overtime I realized that I love her and I will do everything to get her back. Help?
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