There will always be 2 points of view on this issue.........
Keeping in line with the continuity of the story he was more pissed off at her in BK after Tarun's phone call, then he showed up at the airport and then he saw them together. So him getting even would be very justified.
She saw him with Sanjana and there was the issue about the gift of LV but I think he had more reasons which were building up the jealousy and resentment inside of him so to make her understand that she was his - he would have to be the initiator and an angry one. So fantasy would go in line with what has happened so far.
Let her show her initiative and intelligence at work.........he needs to be impressed by her mind too............
Just my 2 cents.............or maybe more...........