Not sure if I like how MC handled the situation, but grumpy girl is HOT so I'm in.
Seriously, the hair over one eye and the prominent fangly teeth, then the blush...
The fact that the MC is handling things poorly (an understatement tbh) could've been narratively fine, but the real issue imo is how all of her love interests are essentially (unintentionally) charmed into engaging in a relationship that they very much THINK is toxic but they're convinced to be fine with it because they "love her" enough to ignore the huge red flags.
Usually you want to make relationships with a start like this one work by clarifying that the red flags were imagined or a misunderstanding, but so far this story seems to be running on the premise that the girls still believe the red flags to be true and just choose to ignore them out of blind faith, which is absolutely NOT a healthy way to approach relationships.
This is literally how plenty of real abusive relationships start, ignoring someone's red flags until you're too emotionally attached to leave even after they become explicit and destructive. They're essentially just getting lucky the MC isn't actually a scumbag and won't actually take advantage of them knowingly.