Jim has been married a couple of times before, they all cheated on him. Now he is with Isabelle, and although he is scared to commit again, he is more scared that she might leave him for somebody else. As Jim and Isabelle's relationship grows, he becomes increasingly jealous, and he comes up with ways to track her every movement - just to make sure that she will never leave him.
Everywhere
Jim has been cheated on before, so this time, when he meets Isabelle, he wants to do everything he can to make sure it won't happen again.
