Why the heartache does not go? Unable to forget?

We were mutually and naturally attracted to each other. I loved his attention, his personality even his his flaws but I pushed him away in intial stage of our interactions as I knew society will never support us as he is one year younger than me and he also looked younger than me. Last year he got married. It was devastating to see him with someone else, when I saw the girl I thought he married his dream girl, he used to tell what kind of woman he would like to marry, thin, fair, long hair societally conventional beauty. I intuitively knew this and never encouraged or acted on whatever we had. Despite knowing all of this I am unable to move on from my heartache and I am also unable to form genuine likeness to other guys despite efforts but I really need to do this for my own wellbeing as I desire a loving who I can appreciate and love.
Why the heartache does not go? Unable to forget?
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