You should be there for others.
Cam's brother was stranded on the middle of the highway and called Cam for help.
Cam has to respond to his brother.
Cam tells his brother that he'll get there as fast as he can.
Cam doesn't want to drive on the highway, so he makes his brother call someone else.
Cam's brother feels appreciative and feels less scared about being stranded.
Cam's brother feels like Cam betrayed him and trusts him less.