Her (Jordan) gray, sun-strained eyes stared straight ahead, but she had deliberately shifted our relations, and for a moment I thought I loved her. But I am slow-thinking and full of interior rules that act as brakes on my desires, and I knew that first I had to get myself definitely out of that tangle back home. I’d been writing letters once a week and signing them: ‘Love, Nick,’ and all I could think of was how, when that certain girl played tennis, a faint mustache of perspiration appeared on her upper lip. Nevertheless there was a vague understanding that had to be tactfully broken off before I was free.
– F. Scott Fitzgerald
The Great Gatsby. Chapter 3, Nick describes his relationship with Jordan, whom he thinks he is in love with. At the same time he is telling his ‘girl’ back home that he loves her.