Responses
(From what I read in novel)
Felix never fell inlove before , Isaac is the firrrst,like first held with (s*x) and fell inlove with. He's so freaking loyal mah maaan. (kinda there's misunderstanding in season 2 thou and its so funny!)
BUT i don't know how to explain him not being suspicious of Benjamin and him not able to guess Isaac being omega, probably he's kinda dumb on the people he care? or just dummy (coz in the novel he reveal her gender at the climax of the story like let's say isaac is about to die scenario) or (〜 ̄△ ̄)〜
Felix probably already knows Isaac is an omega lmao