Should I start talking to my crush again?

I had liked a girl for 5yrs , i finally got the courage to ask her out 2yrs ago and she rejected me. We had really good chemistry with each other and I haven't talked to her since she rejected. I could not get over her maybe because she was my first love but lately I've been having dreams about her, and I'm thinking of contacting her and try to win her over.
Should I do it or not?
Should I start talking to my crush again?
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