I think it's all new to the vaada boy. He has come across this kind of straight forward lady for the first time. Expect sai's attempt to suicide she has not shown her vulnerability even once. May be it somewhere hurts virat's male ego or he cant digest the fact the like he has done compromise in the name of marriage, sai has also done same compromise. He thinks himself of some mahaan atma who did ehsaan on sai and when she says that she doesn't need him all her life his mhaanta his hurt🤣
And another reason ia ofcourse he already likes her and doesn't like it when she talks about leaving him
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