With Sai even the insinuation that she has gone against him and his family, in Sai's absence its easy for him to get this angry look and go on with "Pata nahi main kya karunga" . His "pata nahi main kya karunga" doesnt come when its his family or Pakhi. "Pata nahi main kya karunga" in itself denotes he has no control over his anger when it comes to Sai. His "pata nahi main kya karunga "only comes when its about Sai.
True yaar, he would be hurt for himself first and then for hurting Sai. However with the way CVs have dealt with Sai, Sai will forget her mistake and if Virat goes extreme with his behaviour this time, it would be more about her self respect, because thats what is going to be questioned by Zillat Arena..and probably Virat.