He needs to do better. Perfect isn't good enough.
Once his father sets him up with the Great White Shark, there is no room for mistakes. The whole point is for him to stop slipping up and get back on track. Now, what would his father say if he knew Shark and Theodore have been sleeping together this entire time? That Shark's the one taking Theodore around, letting him in, showing him the tunnels? The price of failure is far too high. This late into the game, they can no longer afford to lose.
Laith makes a point to tell him just how stressed this song and dance makes him exactly, but Theodore is unable to grasp the severity of it. Reopened wounds and bad habits aren't enough to put it into scale either. Will he ever see the pain his actions cause? More importantly, will he see it in time to change fate? He's the reason Laith no longer has a support system, after all. A ticking time-bomb always explodes.