he's not particularly mad just because he hasn't said i love you, if you read what he's saying he's upset that just small things like pet names, or kissing makes Garam push him away and he is wondering why they're even dating if the only thing their doing is having sex which is exactly what they were doing as sex friends.
He was just elated a chapter or so ago about how Garam tried hard to cook food for him... like i get it but shouting at him before even trying to discuss calmly is kinda not okay... and again i came from reunion where mc is struggling with a lot that ml doesn't know, but he is so understanding, so i got whiplash from this...
fr plus not only that he was utterly bothered and anxious about Garam's ex too which adds to why he's upset (he's prolly frustrated from not knowing Garam's past)
idk... like reading this after reunion is wild. the mc there is so patient and understanding. Jeahyuk really didn't need to blow up like that. And I think it's okay to take tour time getting comfortable with saying ily... like they haven't been dating that long some ppl take months to say it.