The couple have been dating since meeting on the set of the 2009 comedy Dhoondte Reh Jaaoge.
He told The Times of India
"I have to specially discuss those scenes with her! I make sure that she's aware of those scenes!"
The pair were rumoured to be engaged after Khan's brother Saif announced that he will marry long-term girlfriend Kareena Kapoor later this year.
In April 2011, Khan said that she does not want to act opposite her boyfriend again in case audiences get bored.