Omj, I love this song so much. I love the video, because of course it has justin in it, but 2 me this song is just plainawesome, it's very catchy, and you can get the chorus out of ur head the first time you hear it. It means that she is stuck on this guy, that it's like she's on drugs. She wants to be with him but knows it wont work out, so she needs to go to rehab to get over him. Pretty cool tune. Love it :)