Novel something like this. A good girl who MC thought was the one, goes and picks Chad. Chad pump and dumps her. She realizes her mistake, and comes back to MC. But at this point, MC are so void of any feelings of her, MC ignore/ let her reap what she sow. MC can be female as well.
Legend of Futian Girl and MC are childhood friends. Their fathers are closed friends and even celebrate the new years together. The girl did not actually have a relationship with another guy. However, she publicly rejected MC thinking that MC likes her, but he’s trash, and she’s way out of his league. This is when MC was just asking her to train together, but she obnoxiously thought he was flirting with her. Then later on, MC proves his strength, and she regrets it. They stay as friends but not as closed as before. More like just colleagues/classmates