I really hope the original piece of shit who tricked her gets some punishment for his actions.
Her first boyfriend really did nothing wrong. He didn't trick her at all and everything he said was truthful. Meguro sleeping around was of her own agency in her search for how she felt with sensei.
In any case, I don't get why people still think sensei revenge fantasy arc is gonna happen, chapter 30.5 gave closure to his arc with a literal goodbye, and went over Meguros feelings on the matter, and pretty much plain as day stated that he didn't do anything wrong and that they were just on different wavelengths, and even says that it's because of that Meguro met Koga.
At least it's better than when people were salivating at the thought of him coming back for a shitty NTR arc.