I think u looking for this one or maybe not
http://www.mangago.me/read-manga/no_love_zone/
The story line sounds a lot like this http://www.mangago.me/read-manga/no_love_zone/ but The mc isn’t a famous person. So idk if it’s that or not.
this one i think http://www.mangago.me/read-manga/see_you_agai/?RYvg

Ok, I need to find a yaoi. It's about like a famous guy and he rejected some one when he was younger or something and then the person he rejected turned into his manager. And he is also in like a abusive relationship and the manager doesn't understand and is rude, then finds out famous guys past and forgives him. Idk it's something along those lines.