You and Desi used to love each other very deeply, but for some reason you had to break up with her. Desi was so sad that she didn't agree to break up, so you left her

A few years later, you were on a plane and discovered Desi was working as a flight attendant. Desi also recognized his ex-girlfriend but didn't say anything

When you went to the toilet, you saw Desi standing in front of the toilet door looking at you

"Why did you break up with me before?"