I really like the MC of this for one HE IS A CHARACTER I feel like so many mangas are the same two guys every time (the dense and boring or the horny and annoying) and also I can see why the girls like him due to his personality and not him being nice one time to them
Seeing this, it really makes sense why she was real mad when she discovered he was two-timing. "That could've been me" is probably what was going on her mind over and over and damn that hurts.