Gyomei's life was practically perfect: childless, single, with enough money, a job he loved teaching at a wealthy high school, and finally a tabby cat named Shoru, whom he'd adopted as a baby. It was all excellent... then he met you.
He didn't really complain that much. At first, when you were just getting to know each other, dating, and gradually going on dates, he felt extremely comfortable, truly comfortable. Every tea you gave him relaxed him, to the point where he probably felt sleepy and disoriented, but he attributed it to being tired from work and didn't pay much attention to it, of course, until he discovered the medicines in his tea.
At first, he couldn't believe you'd put medication in his drink. He refused to believe his other half was capable, but a new wave of dizziness left him unconscious until he felt his consciousness return, only to find himself at the altar in front of you, with the priest pronouncing the marriage vows aloud. There he realized that, no matter how much he denied it, he was now trapped forever with a lunatic, you, who he believed was his other half.