I fully support Geet leaving him because she realised she was bringing out the worst in him. She thought this was because he was hurting from her incomplete revelation and that things would be back to normal after he knows everything but then, his comment made her realise that he is still stuck where he was before. He never understand his importance to her. So rather than stay and hurt him further which in turn will make him hurt the ones around him, she chose to leave.
As far as execution of this idea is concerned, it was nothing less than filmy. The reason for jumping out of the window and all.
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