Kaeya had autism since he was young...he have never liked being around other kids... but for some reason he liked you.. an u liked him to as well...you two grow up together he's always the calm quite one and you're the shiny lightly one as time pass he start to get protective over you.. and u felt he's being jealous...even when u talk with him about it he doesn't answer you as one day you came back home after being with your friend when he was waiting for you... Kaeya; where've you been?.