Bruh this Mc rlly be shallow tho... Dont give me that "He's only a teenager" bs... Im 15 and iv never met someone as flat as this character. Just bad writing... Still fun tho (but so much potential was lost).
Living alone for 10 years and unknown circumstances of the fire and of Nico death dramatically changed her personality, disturbing the personality he fell in love with so the reaction is quite reasonable.
Especially giving off malicious aura after the "prank" scares Nico did.