Stutter disappearing around my girlfriend

Stutter disappearing around my girlfriend I was in a relationship about two months ago and while we were dating I started to notice that my stutter just disappeared or mostly decreased significantly while talking to her and the same happen while talking to my math teacher anytime during the whole year. (who also used to stutter) I kept forgetting to be conscious of the changes when that happen so I never figured out why . Does anyone have a idea why or how it happen ?