So he lied to her, raped her and simply claimed she was his fiance and she just accepted this? The tons of problems in every other chapter are because he's literally a brat. And him becoming a teacher simply because he was "inspired" by her being kind to her students is stupid. Doesn't seem like his actual dream honestly. More like fake admiration because someone he loves is a great teacher. It's a trope I hate. Probs just because being a teacher seems like a really annoying job.
Apart from the tons of red flags she simply ignores (and the fact she accepted his feelings even though he is probably 17), th sex scenes were boring. So repetitive and useless honestly. 90 whole chapters for him to graduate and the only problems in the whole manga is misunderstandings from both of them. They stay silent for a few days and then have makeup sex. Boring and repetitive.
My Matchmaking Partner Is My Student and a Troublemaker