Should I be worried?

My boyfriend and I have been dating for 6 months and we are both 16. We also live about two hours away from each other. He drives one of his really good friends ( who happens to be a girl) everyday to school. Lately she has been posting videos of them together in the car and saying that my bf is “the only boy I will ever need❤️” and “ he’s my best friend in the entire world”. I’m not the jealous type but it makes me feel really insecure and worried. She has been posting this type of stuff for awhile and I’m not sure what to do. Please give some advice!