https://www.mangago.me/read-manga/loss_time_ni_hanamuke_o/
This?
Things I remember about this BL - i think it was a stylist x popular person (like a public figure i forgot their profession) - they already broke up during the start of the story but one of them (i think popular person) asked for another chance - stylist gave in and set a deadline to when they'll break up - they will break up (again) after watching......