I miss my ex terribly. What must I do?

I got married three years ago and have a cute little daughter. Before my marriage, I had an affair with a girl. She was very beautiful as compared to my wife. She used to love me very much and always wished to marry me. Once she gave me a very expensive gift. She was more than forgiving and very pure. But I had never loved her that much. When I got married, I dropped all sort of contact with her. She got the message and never contacted me after that. It has been a long time now. But I miss her terribly. I don't know why. Do I love her? I always feel I hurt her. She never made any mistake. I was the one who left her. She trusted me.
I miss my ex terribly. What must I do?
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