Hey looking for thus omegaverse manga where both the seme and uke are office workers, but ...

Hey looking for thus omegaverse manga where both the seme and uke are office workers, but the uke have already bonded with someone but that person died and he feels guilty having a relationship w the seme, and the seme misunderstood that the uke is being neglegted by his mate abd says that he is better or something but that's how it goes so plsss help