Writers/Readers: Please help me out!?

The bodyguard is a tad unrealistic, yes. It's unlikely that someone who is mentally unstable will be assigned to look after someone's daughter. You could always have him taken away from his family and the only way he can return is if he agrees to undergo intense treatment? It could be experimental treatment too, like clinical trials, but be careful it doesn't sound like The Bumblebee Flies Anyway.