He admitted that the mistake had been partly his... Perhaps he should never have tried to make you feel jealous, but you didn't seem to give a reaction to others approaching him either, it was obvious he would be a little upset... But your attitude was too extreme, leaving like this out of nowhere when he was busy with work.
He couldn't go to make peace with you. He was busy with work and when he was free he couldn't think of the right words. So it was that he went like 2 months without seeing you. Not even a message.
Due to how much time passed without news, you had assumed that you broke up. That's why now that someone was interested and asked for an appointment, you didn't see much of a problem, especially because it was difficult for you to reject.
This was how Jing Yuan found you on a date with one of the soldiers.
"Walking around instead of working?" he asks the other, even though it was his free time, but he didn't want to see him near you.