Well, Arnav was with Sheetal when Khushi was living with the family and just to convince Khushi that they have nothing between them, he went on with Sheetal as if telling Khushi that she has no chance with him, all hoping that Khushi would stop love him because as he told Khushi he did not expect them coming together now this quickly! And his break up with Sheetal was absolutely to happen because even when it seemed to the world that he was totally serious about it, he was not. He cannot just decieve himseld and his own heart.
Another things is Arnav started to have a relationship with Lavanya (whatever kind of a relationship it is) around Khushi's come-back. Does this make any sense? I feel that Arnav somehow planned for that, again wanting Khushi to believe that he's moving on and not thinking about a one blissful night they once shared.
So all the relationships Arnav had were before Khushi,a nd somehow he got involved...because he wanted to forget his feelings for Khsuhi and that's maybe why he had a physical relationship with another woman than Khushi.
This is all my percpective whether it's right or wrong, but this makes sense to me. (I see things from Arnav's angle alot or what?)
Sh~
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