Robbie is a character introduced in *Scream 4* and is played by Erik Knudsen. He is a sweet and charming guy who develops feelings for Sidney. However, their relationship is complicated by the fact that Robbie is a close friend of Sidney's cousin, Jill Roberts, who is actually the main antagonist of the film.
So, while Sidney doesn't have a full-fledged boyfriend in *Scream 4*, she does experience romantic feelings for Robbie, and their dynamic plays a role in the film's plot.