In this film, Cady Heron moves to a new school where initially she makes some unpopular new friends. She is soon invited to join The Plastics, the schools popular, but extremely mean girls. Soon Cady becomes a person she doesn't even recognise, leaving her old friends behind, doing things she never thought she'd do, just to stay popular.
This relates to the narrative in our music video because the girl becomes so concerned with her popularity and social status that she even ignores her own boyfriend because he is not cool enough for her to be seen hanging out with and when they do hang out, it is in a private location which no-one else knows about.