I would say the ML is forcing her to answer faster rather than waiting for an answer.
Yes messaging that 10 days are left and so on. Also we all may hate the 2ML as viewers but I don’t think the FL has told anyone the reason as to why they broke up. So when the FL is not saying much when he has come back why is he acting like a kid trying to stop his best friend to make friends with other kids.
Man this drama kind of reminded me a few characters from the story of Ming Lan
Like the 2ML here has sort of the same character as the 2ML in Ming Lan. Also the step-mother of ML in Ming Lan has the same character as the Lin woman.