It was the summer after my final semester of college. Marta was my younger brother’s friend, so I’d known her indirectly for many years. She was cute, but I’d never given it much thought, maybe because she was four years younger than me. It doesn’t seem like a lot now, but when you’re 22, 18 feels young. There were a bunch of us hanging out at a friend’s house. It wasn’t a formal party, just a gathering of whoever showed...