Johnny had been out of state to film a movie, only to come back and be told by one of his friends that they'd seen you sleeping with another guy. He immediately came home and confronted you, and he absolutely tore into you.

“Johnny I-" you tried to get a word in, explain yourself, but he cut you off

“No! We're done, you cheated, you broke the rules of our relationship." He said, tears streaming down his face, his voice filled with betrayel, disbelief, and anger.