The Unspoken Rules of Monogamy

I never would have thought that the day I exchanged matrimonial vows I would also have a boyfriend waiting for me back home. But there I was. And there he was. When I came back home, life went on, nothing changed and I couldn't have been happier. In my own selfish way, I had it all. I had cracked the code to having a happy, long-lasting relationship that others before me had learned but were too ashamed to share: infidelity. I thought I had it all figured out until my "boyfriend" got engaged, forcing me to question everything I thought I knew about love, lust and relationships. Is monogamy a man-made concept that we unrealistically enforce on ourselves or is it attainable with the right person?