I don't think Maan is insecure about Dev....he told Dev to leave so maybe that is why he reacted that way...thinking that why Dev is still here....I dont know...he has always been a bit insecure methinks (you only have to go back to pre-confession days to see it in action in full force)...so that personality trait disappearing overnight seems highly unlikely.
However, with normalcy returning to Dev and Maan's relationship, insecurity seems unlikely. I am really confused.I would prefer if it were the former- I think that would make for an interesting track!