It's wrong to steal things from people.
Tony got fired from his job and is behind on rent.
Tony wants to be able to pay his rent, so he doesn't end up homeless.
Tony asks his neighbor for help with his rent.
Tony breaks into his neighbors house because he knows they have cash hidden under their bed.
Tony's neighbor helps pay his rent giving him time to get a new job, they also become closer and become good friends.
Tony's neighbor catches him breaking in and shoots him killing him.