nah, he have been in entertainment industry for so long that i just don't think he would get that worked up over that other guy having stolen one or two of his job like it wouldn't have felt as rushed if it were at least paced between two or three chapters that we got to see ian has his job opportunities being taken away from him one by one then i would've understand why he react that way.
and logically, he should've known (he is pretty smart after all) that rejecting the offer would lead to this kind of situation like why does he seems so surprised, i just don't get it, he's not naive abt the entertainment industry so i just rlly think this last chapter make him seem so out of character from what he usually is
his anxiety isn't exactly sudden, n even if it was, it would still make sense bc sometimes that's how anxiety works.
ian's been feeling anxious for awhile, he just don't show it well in his character but he shows it in his words kinda?
+ he's good at dealing w other ppl's problems but that doesn't mean he's gonna be the same way when dealing w his own issues, he probably has major trauma too which makes him not want to rely or burden anyone
i could be wrong but this is just how i see ian's character, doesn't feel ooc for me tbh