Pete
You'll know when he's jealous because he'll stare down whoever he doesn't like. He'll hint that he doesn't like this to you by becoming clingy. He'll take your hand and kiss you multiple times.
Patrick
He tries to hide since he's a generally understanding guy. Although, he will do subtle things like kiss your knuckles and hug you.
Andy
He'll attempt to take your attention from the person by dragging you somewhere else. When you question why, he tries to deny it but you know he's insecure when it comes to you with other guys.
Joe
Easy, he'll make sex jokes. He tries to make the other person as uncomfortable as he feels when they hit on you. He continues this until they leave then smiles proudly to himself
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Fall Out Boy Preferences
FanfictionJust some Fall Out Boy derps when I'm bored. {BE WARNED I'M A TERRIBLE PERSON AND A PROCRASTINATOR THERE ARE LONG PERIODS OF TIME WHEN I DON'T UPDATE}