How to forget my first love?

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After ten years,She has her family and I have mine,but we met by chance last year and then kept in touch to this day.She part with me not because she did not love me but because i went to another city to study for four years and I havn't gone back to her city after my graduation,she wanted to live with her parents and couldn't come here.I want not to hurt my wife and my daughter,I'd rather not met her last year,I want to forget her ,but how??