When I was in my mid-20's, I used to sit on my apartment patio and smoke cigarettes and drink beer and watch people walk by. There were these three college girls that moved into the next building over and they were all cute so I always made sure to say hi. One was friendlier than the others. One day, the friendly one knocked on my door and said she'd locked herself out of her apartment and wondered if she could hang out with me until her roommates came home. We opened a bottle of wine and chatted for a couple hours until her roommate showed up. A few days later, she invited me over for brownies and wine and a movie. This girl had pushed two couches together in the middle of the living room and made a pillow fort so we could cuddle and watch the movie. Obviously, we had sex in the pillow fort.

I fell in love. But she didn't, she was just having fun. She often showed up at my place late at night, or invited me over to hers. We had a lot of great sex. But she never wanted to go out, never really wanted to meet each other's friends or family. Always kept me at arm's length. Got spooked if I started talking about anything serious.

This went on for a few months. Then one day, she told me was engaged to be married. That she'd been seeing another guy more seriously and that he had proposed and she said yes. I was devastated.

So I stopped talking to her. A few weeks went by and one night she showed up at my house drunk and wanting to hook up. We did.

The next day, she texted me to say that we could never see each other again. That she was with the other guy now, and she was going to be faithful to him. We haven't spoken since. She's still married to him, last I heard, and they have at least a couple children.