You and Tristan were at a date, a prank one, that his friends dared him to do, but you didn't know.

"How's the food?" he asks as he smiles to you, actually feeling bad about the situation

he was planning on telling you during the date, since he had no feelings for you...or so he thought. it has come to his realization that his feelings for you bloomed at this date, and he started to regret his actions, so he decided to keep it all a secret