Disclaimer: I don't own Life with Derek, Disney Channel does.
He was not jelling. Not at all. He was just upset that his plan didn't work. Can't Casey see that Max was just not the right guy for her? Why could she never understand, that any friends of his or friend of a friend of his could go out with her. It just wasn't right. Casey, the sweet girl, wouldn't understand, but all the guys that he knew, would in the end hurt her. And what was better than to see a crying Casey from other guys. She was hers for him to tease with. And that though annoyed him. He didn't want to look like he was jealous at all. He just was upset that Casey was falling for another guy again. And that annoyed him, just a little too much.