It's another, if it ain't one thing
Instigators, like putting fire on propane

from Justin Bieber – All Bad Lyrics on Rap Genius

Meaning

Selena and Justin have gone through a lot — before their last break up, they had broken up several times before that. It’s always one thing after another going against their relationship.

According to JB, a lot of these are Selena’s friends, who just make everything worse when they get involved — it all blows out of proportion, like when you drop a match on something doused in propane.

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