Newt.
His jaw will clench and the left corner of his mouth will form a small, but a very fake smile. He'll also glare at the person until you put him at ease by dragging his gaze away and giving him a sweat kiss.Gally.
Simple. Threats. Lots and lots of threats towards the person he's jealous of, although they're often subtle, surprisingly. There's not really anyway to calm him down unless you drag him away and then once you have him one on one you let him vent it out while he paces back and forth and tells you exactly what he thinks of the Glader in question.Minho.
His hands. They'll clench into fists causing his bicep to flex. He'll relax once you touch his arm, though.Thomas.
He'll make more plans than usual with you, keeping you as close as possible. He will occasionally ramble as well, trying to avoid the topic.
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The Maze Runner Preferences
FanfictionThe Gladers are Newt, Gally, Minho and Thomas. If you wish you can make a request for another character at the end and I can do a catch up page :). My personal favourites are Newt and Gally so that may show in the preferences. Enjoy :).