i dont think people are really understanding the symbolism of the video. When it starts out, childish is in control. Shes the one looking at him and buying food and chasing him hence why he's in the drivers seat. Then when he gives in by hooking up with her. She starts driving b/c she has taken the control back and goes back to the other guy at the end.
Came in the thread to post the same thing, it's all about being in control of your feelings during the breakup.
He's driving (controlling himself) for most of the videos, but when they hook up, he has feelings for her again, which is when she realizes that she's in control and just hops out of the car. She's driving in the end because she's now in "control" of his emotions, or at least, he no longer has any control of his, and misses/loves her again.