I don't see any romantic feelings from his side, Doctor's words about Bulbul being his "Everything" was just lazy writing IMO, the man put a bullet in her and didn't utter a word about killing the woman he loved, I believe they would have spent more time in romantic nature of this relationship but they didn't because it wasn't there, his perspective about life and his brother changed after Bulbul's death, it was more about growth of an individual rather than a romantic relationship
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