" Toh teri shikayat Kya hai, ki usne rishta nahi nibhaya, ya jaan nahi di? "

This dialogue hits hard. Dev never blamed Sona for leaving his family, his only complaint was that she left & #39;him& #39;. He knew that Ishwari never wanted Sonakshi, and always blamed her.

#KRPKAB

His family, did not deserve Sonakshi. He not only questioned Ishwari& #39;s expectations from her, he tried to make a point that the main reason was not "rishta nibhana" that Ishwari was talking about
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He knew by this time that Ishwari did not want Sonakshi in his life, all the reasons and complaints were hollow, meaningless. This was something more than a taunt. It was an attempt to make Ishwari realize what she& #39;s been doing subconsciously. But she never understood.
#KRPKAB