Originally posted by: Samanalyse
Here's the way I see it:
Dev did soften considerably after he found out about Sona's trip to Delhi and her attempt to tell them about Soha, He also took her words about Soha being small, and therefore easily overwhelmed, very seriously. That is why he backed off completely and refused to pressure Soha into accepting relationships that she wasn't ready for. He also didn't want to antagonise Sona in any way that would cause her to recoil and restrict him from seeing Soha. He was still angry at Sona for hiding Soha all of these years, but her words helped him put that anger on the backburner and focus on Soha's needs first. The anger didn't disappear, it was just conquered by a sense of higher purpose.
Not only anger, Dev was mashing down a lot of very intense emotion, and it all came bursting forth when Soha called him. He thought this was validation for his patience, and just as he rushed forward, he heard Sona's voice holding him back. Overwhelmed by emotion at that moment, Dev felt like his opportunity was being snatched away by Sona's voice and he reacted emotionally. This was a crucial moment. We already saw what works and what doesn't in the office confrontation. Dev needed to be reminded of that sense of common, higher purpose. Instead, Sona said -- "It's only been three days; why can't you have some patience?" She inadvertently belittled something that had taken all of Dev's will-power, at a moment when he was most vulnerable, and that connection she established in the office was cut off. Dev begins to wonder, "if she doesn't appreciate my efforts, then are we really in this together? Was I naive to believe that we were? Is Sona taking advantage of my deference to keep my daughter away from me?"
Instead, if Sona had something formal like, "I know this is not easy, but thanks for your patience; it will really help Soha in the long run," she would have tapped once again into Dev's sense of higher purpose and his patience would have stretched a little longer. Even after all these years, Dev is putty in Sona's hands, if only she knows the right buttons to press. But then if she had ever known her power, they would still be happily married. She is also scared, and putting up an cold, angry front, which makes a cynical Dev believe that he is being taken for a ride.
Dev is mad at Ishwari, but he mostly blames himself. He couldn't do what was needed to make the Ishwari-Sona bond strong. Neither could he convince his mother that she was the right person for him and their family, nor could he make Sona feel adequately loved and accepted. His happiness walked out the door with Sona, and ger willing to do things solely for Ishwari's happiness. He acceptd the fact that their happiness was in different things and he remained without a permanent partner and planned to for the rest of his life. With the knowledge of Soha, Dev has that glimmer of hope that he can at least give happiness to one of the women he failed, and that takes away part of his burden and gives him a lot of peace.