For me, I realized that I should have been dating my girlfriend’s best friend a few weeks after I had become exclusive with my girlfriend.

She laughed at everything I said, but it meant nothing.

Plenty of people who would never speak to me otherwise, let alone date me, have laughed at things I said.

When we did kiss, it was like I was introducing her to the concept of what kissing was. I second-guessed myself—and instead of vowing to trust my instincts in the future, I kept on doubting.

I doubted my way through relationship after failed relationship.

Sometimes a decision that seemed perfectly appropriate at the time turns out to be a mistake.

It’s happened many times in history: the Bush presidency, the XFL, Prohibition.

As a crazy coincidence, we discovered that we were neighbors. I soon learned that Christine was far from perfect.

I lived in the last door of a hallway, she lived in the second to last. She was from a small town in Ohio and had grown up very poor in a family that didn’t place the highest value in education.

I told her that I enjoyed that she loved me, and that one day I hoped to love her, but I just wasn’t sure, at that moment, if I was able to feel the same way about her, and I didn’t want to lie. To be sure, I felt somewhat guilty that I might hurt Christine’s feelings. And for at least a month, dating Kathy was amazing. Of course, we also kissed each other and slept together—although therein lay some difficulty.

Though she said it was OK, two weeks later we broke up. We would go to dinner, talk about physics, see movies at the campus theater, get coffee, meet each other on campus, etc. Whereas Christine had liked me too much, Kathy was more aloof.

She was very kind, very nice, and although she was very intelligent, I found that there was something missing. She lacked the same cynicism, skepticism, and curiosity.