What could an explanation be?

(ik this is a sorta stupid question) but i noticed that when me and my ex first met his eyes were dark blue (we would always make eyecontact) and once we started dating i noticed his eyes were green, and i read somewhere they could change for different emotions and like... i was wondering from yalls experience what emotions could he have been feeling?

-my friends would also always argue his eyes were blue and not green
What could an explanation be?
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