As a Zoey fan, I am a bit upset he's after her because the guy is also sleeping around too much with questionable choices like Arieth or Becky, but I am also relieved she turned him down, I may be biased but he started to give me suspicious vibes since episode 7, I saw the pattern, where he appeared every time, the code calling, all that.
A lot of people think he's just a good brother looking out, but I think he's "looking out" way too much, especially at the end being the last DIK at the campsite, so I started to wonder why he's always around at certain points and now questioning our loyalty makes me doubt him even more.
Aside from the whole arrest at Hell's Week angle, there must be another motive for him to be the one, if so, he's obviously being used as well as Beth and those other girls.