For the first four years of our marriage, David and I were the couple our friends envied. We met in our late twenties, both driven, ambitious, and deeply in love. David was a charismatic venture capitalist, and I was a freelance graphic designer who enjoyed the flexibility of working from our beautiful suburban home. He was attentive, affectionate, and constantly surprised me with spontaneous weekend getaways and handwritten notes. I thought I had won the lottery. I thought I knew exactly who the man sleeping next to me was.