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Omg my kind of trashy story! If you find the name of it please share the name it sounds really interesting!
I think you're talking about https://www.mangago.me/read-manga/i_woke_up_and_cleanly_let_go_of_my_stolen_fianc/
This reminds me of this one i vaguely remember (with the exes behavior) where the female lead dumps the ex because he cheated on her at school and he’s all huffy about it because it was ‘just supposed to be a school fling’