Sims 3 Butler Leaving for Another Job?

My butler in Sims 3 leaves every day at around 2:30 pm when the message pops up that says "So-and-so has to leave soon. He has to be somewhere else." I followed him, (he was also driving the taxi for some reason) and he went into the diner right before 3 pm. I remember seeing him before in the outfit for the cooking career randomly (not knowing why), which seems to match up with what I saw, and my theory that he has a job there. How did he pick up a job at the diner in the first place? Is there a way to kick him from his job so he stops leaving every day? It is getting annoying to have to rehire him at 10 pm every day >.<