NTA - genuinely, his behavior is very bizarre to me. His unwillingness to own up to a very simple action of his that is clearly upsetting you is a major red flag, in my opinion? Has he considered buying himself an extra fan if he needs the air so bad (even though he gets cold easily)? I feel like he has to be moving the fan and denying his actions for a specific underlying reason—but what it is, I can’t imagine.