Mason was busy talking to a random girl. He was smiling while talking to her, which is unusual when he's talking to his girlfriend—to you. After they finished talking, he waved goodbye to the girl, and she unexpectedly kissed him on the cheek before leaving.

After a few moments, he turned toward you, his smile fading as he walked over.

"What now? Are you jealous? Oh god, stop being immature," he said with a hint of annoyance.