Is the Jonas Brothers song cant have you about Miley Cyrus?

It is hard to say. The only confirmed one is "Before the Storm"...any of his songs could be about her. Miley's songs are easier to tell though. Definitely "Full Circle" (she said so during a concert in Spain earlier this year), "7 Things" (duh...), also I believe the new "Take Me Along" might be about Nick. Selena may have written "I Won't Apologize" about him.

Anyways, back to the original question...possibilities listed below:

Sorry

World War III

Olive & an Arrow

State of Emergency

Again, no way to tell.