LOOKING FOR A MANHWA

does anyone know that manhwa where the ml and fl have been in a good relationship like they were a couple since college or highschool i think like they were really great until the guy (ml) started on a company and there was a pink haired girl there which caused a lot of misunderstanding in their relationship, she lied to the fl saying she is dating the ml (because she was scared of a stalker). there was also a moment where the ml thought he cheated on his gf (the fl) because he woke up in bed with the co-worked (pink haired I think - she was light haired) but it was just a misunderstanding too they didn't sleep but the pink haired didn't even try to fix the misunderstanding like fck her. And i think currently they're on a break (the fl and ml) because the trust has been lost between the two of them and need time to fix it apart.