Tho mincheol's being dumb, its not his fault for being scared of a breakup, cuz if they would breakup that would mean the end of not just them being couples but even friends,its scary. Ofcourse the bigger reason is due to his trauma(backstory). I feel that us as veiwers expect the story to go in a certain way wanting mincheol to man up, but life dosent work like that, there are going to be ups and downs. He clearly sees her in a romantic way , he cares and he gets jealous of other guys too...lets just read more eh