To everybody here, a little PSA if you will: We are here reading a story and seeing tropes. But in a good series, the characters are their own people and seeing the other people as people (which those family members totally don't do and skip their IU perspective for some mishandled authorial commentary. But that's another issue.). We are seeing a MC-to-tsundere (god I hate these one-word characterizations ruining my mangos) communication and tropes involved. "If he just speedran to the destined end for these written characters, he'd score for sure!" we say. He sees a woman he's been idolizing (still does TBF) and endlessly pestering for ages with only in-universe very expectable endless rejection as a result. He realizes he's not the prince charming, even if he actually totally is as the MC. Forcing your emotions on another through very vocal dislike is a shitty thing to do, m'kay, so he decides to stop.
Remember, if he wasn't the magical ML and that was the darling FL predestined to some other main character of another story, he'd be a quite the detestable antagonist with his conduct. We'd hate the shit out of him for being a delusional, pushy creep. Or the silly non-person mob to be laughed at, if it were played for laughs and not for impact. Fair.
The biggest issue with him is all that idolization and carrying her on a palanquin. Common, to be fair, but still not lucid or healthy.
Tl;Dr: Y'all handling him as the hero of a story, even if he's in-universe just another chump. If he saw himself through the perspective you're trying to push onto him, he'd belong into an asylum.