you and Newt had known each other since birth and you had been dating for 5 years, he would easily get jealous when you talked to other guys in a friendly manner

One day you were walking with Thomas having a conversation and smiling, Newt had just come out of the homestead and saw you. He walked over briskly and grabbed you by your waist "Hey Love" he said, obviously faking calmness and ignoring Thomas "What are you up to?" He kissed you gently and smiled