Koeman is such a stubborn, bitter, clueless clown. Rewarding Greizman, Busquets and Lenglet over and over and over and over again for 0/10 performances. Puig comes on to be MOTM in 20 minutes after not playing any minutes all season and then gets benched again.
I'm sorry but there's a certain level of professionalism one needs to show - this is a personal issue hampering his decision making. In the normal world, it's the equivalent of sleeping with your subordinate and then firing him/her because she doesn't want to continue sleeping with you anymore.