honestly i dont even think its just a matter of stupidity - she never considered that serhat could love yildiz bc she thinks she's better than her due to her education and having been raised in a modern and sophisticated upbringing
him going to the hospital and staying by her side until a doctor has to kick him out bc the visiting time is over and then he goes to the bar and drinks until he passes out and that's his every day routine bc without her he's so miserable and his life is meaningless
and this would only get more buzzy if serhat turned into an alcoholic in an attempt to redirect his obsession to something else since he doesn't have yildiz anymore
when yildiz gets shot at the wedding and s2 opening scene is a montage of all the months she has been in a coma while serhat goes to visit her every single day and begs for her to wake up and come back to him