they wont strangers, they still used to meet up. they was no rukhsati there and no consummation.
it doesnt mean strangers in the literal sense LOL...it basically means that they were together but didnt know each other...they had no understanding and thats why this misunderstanding came up. Understanding hamesha tab develop hoti hai when you are living together idk why umair and zoobi mein kabhi nahi hui