I thought that maybe the guy wasn't too terrible and maybe it was mostly Karin doing the work, but he is complete garbage. I guess he had some sort of inferiority complex and was super weak to beautiful women, but you don't meet a woman that is not your wife often and for a 6 month period... and now he feels bad about what he did to FMC, so he doesn't want to do it again, because he would feel even worse...