It was told in earlier episode that Alekh is afraid of glittering things and red roses.
( Still so many sarees shown have glittering things 😲)
Also he is afraid of police and plays the same music. I think something in the past is disturbing him a lot which no one is telling. Either it has to b told to Sadi or they should stop the wedding. With Alek getting disturbed on Sadi again and again her life is full of danger only.
One more thought i have is may be Alekh turning into this disturbed situation has something to do with Avni-Naveen .Alekh was smart and intelligent earlier and Alekh was in their path of greed of taking over the Rajvansh empire. So in order to put him out of their way they had made some plan to make him pagal type with some incident.and continuously giving medicine which make him more pagal.