First slap for hiding truth of his perfect marriage from her.
Second for making Vividha to be a part of his lie.
N his biggest sin for which he should get slap is for hiding his pain from her for such a long period. Yess he has no right to hide his pain from his mother just for thought that she already hv bear so much in her life. When she could bear the pain of giving u birth, she can handle anything. No matter u say it or not but a mother can always sense her cub's pain. He was heartbroken, shaken n crying but yet chose to hide this, Suman must take his class tomorrow.
About Vividha, I don't why this dialogue writer always come in btw me n her. I was all set to be her fan today, formatted all the things she done in my mind palace but again that "HUM" spoiled things all again. Koi na better luck next time 😉