Optimistic to a Fault

Kevin's confused about Hayden,
Hayden's confused about David,
David's confused about Miley,
Miley's worried about Chelsea,
Chelsea's confused about Joe,
Joe's confused about Demi,
Demi's confused about Cody.
Cody's worried for Nick.
Nick's confused about Selena,
Selena's worried about Vanessa.

Find out the reasons behind these worries & confusions :]

Characters
Nick Jonas
Kevin Jonas
Joe Jonas
Demi Lovato
Miley Cyrus
Taylor Swift
Selena Gomez
Cody Linely
Chelsea Staub
Vanessa Hudgens
Zac Efron
Hayden Sinclair