I have to disagree with you on that. Sheetal is in RM because of Khushi. But Khushi never said to Arnav to go flirt with Sheetal. If she knew of his behaviour would turn 180 degree from a polite host to flirty ex-boyfriend, Khushi would never have let Sheetal in.
Whether Sheetal lies to Aarav or not, it's her business with her own child. It's none of Arnav's business to tell her whether she should tell Aarav the truth or not. She didn't say that she always used to win against Arnav? She just said that she used to win. Since she never brought his name or his topic, what is it to him what she tells Aarav? Why did he have to butt in a private conversation with his special commentary?
He himself mentioned that the situation will be awkward if his ex and his wife is under the same roof. If he gets that, he should understand that his ex is a guest in his house. Since he know about Khushi's insecurity and what she suspects, he should be polite but not overly friendly with his ex. He doesn't need to, because he, himself stated that she doesn't mean anything. So his wife, who obviously means something, he should keep her feelings in mind and behave accordingly.
Khushi on the other hand planned a family outing. She never invited Sheetal. Sheetal also had no intention to come until Arnav goaded her into joining them. Again, Khushi couldn't have predicted that.
Now Khushi might take a break from finding out Aarav's dad. But will that make Arnav pay attention to her? Khushi planned a family outing to make him happy. Forget saying a simple "Thank you", he paid her back by flirting with Sheetal all the time and staring at her eyes. He never once looked at Khushi beyond what was necessary and unavoidable. This was the guy who couldn't keep his eyes away from Khushi before marriage. But I guess since Khushi is wife, the challenge is gone. Now the challenge is Sheetal.
If he had looked at Khushi, he would have realized that Khushi's eyes were brimming with unshed tears and pain. When a person is insecure, even a small attention or a listening ear or a supporting shoulder works wonder. But where is the attention or listening ear or supporting shoulder? The attention is solely fixed on Sheetal, the listening ear is busy hearing her teasing retorts and the supporting shoulder is anywhere but where Khushi is.
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