Justin hadn't been himself these past few days, his inner consiousness was slowly taking over his mind, and the struggle for dominance had left with him with a severe headache. He hadn't told anyone about it, he couldn't even figure what was going on himself, so why bother telling anybody else? He had thought of telling Ashley, but he knew she'd only tell King out of fear that something bad might happen, so he crossed that off his list. He had to find himself first before he could tell anyone anything.
He had no idea what was happening, and at the same time he didn't want to worry the others with his problems. He struggled to get up and when he did, he did his best to freshen up and keep his face as normal as possible. He already suspected the others knew something was going on with him, but he acted like he wasn't aware of the obvious. If he kept this facade on for long enough, they'll eventually give in and not bother him with questions he had no answer to.