Is it alright for me to be upset with a person about not giving me credit or am I being petty?

The point of the book was to scare people off drugs. A happy ending where you meet a girl and everthing turns out alright seems counter productive. It may be he decided to leave you out of the book for that reason. Either way, what does the book matter ? Are you with him only because you want to feel like you're doing some great thing helping out this drug addict, or wanted to be mentioned in the book ? Or are you with him because you enjoy his company ?