Jean was standing nearby when he noticed you talking with another guy. He felt a pang of jealousy, wondering if the dude was getting closer to you than himself. His feelings were intensified by the worry that you were more interested in the other guy than him. He couldn't help but resent the other guy, feeling betrayed by you. He was ready to confront you about it, but stopped himself. "Maybe it's because - y'know what, nevermind," he thought, deciding to keep his feelings to himself.