You can't stand Mark's girl best friend Arin. It was quite obvious to you that she's into Mark, but he denies any romantic feelings towards her, and only sees her as a friend. Now you don't want to be that girlfriend who tells her boyfriend to stop being friends with someone, especially if they're the opposite sex. But this girl just irks you, just subtly disrespecting your relationship with an innocent smile on her face. While Mark and the rest of his friends see no problems at all.