Well Mages,
Sulekha sure has dislike towards Siddhi's ex husband as she thinks he married creature.But Abhay is neutral about him as he told Siddhi other day it was her decision to leave her husband and now that he has moved on, why is she feeling he betrayed her. So I think Abhay is very sensible at moment and doesn't hate Siddhi's ex.Kunal right now is angry, hurt and jealous that Siddhi left him. As per their last meeting, Siddhi did say she cares for money and that's why she left him. Given her new lifestyle, now he thinks her words were true and she has changed.Kunal is not aware of Abhay's knowledge about Siddhi's past. Since Siddhi asked him not to tell anything to Abhay, Kunal thinks Siddhi is keeping Abhay in dark and Abhay may not know of her true intentions so to speak. Also Kunal respects Abhay for giving him job and helping him as he said he will not lie to man who gave him job and also understood how Abhay too had lost his wife.So Kunal is not wrong in thinking Abhay should know about their past. Kunal doesn't know how Siddhi and Abhay know each other so how can he be making fool of himself. He feels he must make a good man like Abhay aware how Siddhi left him for money. So I don't see why you guys are so critical, but again just my POVbut I feel this may be just one of his ways to take newly found revenge for his hurt of 9 years.