Reiner was your serious boyfriend, he takes everything serious, he doesn't take jokes as jokes, that's why he hates jokes, one day, you told a joke about 'you should date someone other than me', Reiner thought you were serious but he doesn't wanna do it but he does it anyway, llater at night, you were walking alone in the sidewalks and suddenly spotted a restaurant, as you peek through the window, you suddenly saw Reiner dating with another woman, he saw you and notices that you look shock.