The British actor - who is dating his `Twilight` co-star Kristen Stewart - is happiest when he is in a relationship but prefers not to talk about it in order to maintain the "mystique".
Asked if he is romantic, Robert said: "I guess I am when I like someone, I like being in love with people and yes, I guess I am quite sensitive to things.
"It`s important to preserve any mystique you have and also I just don`t feel it`s anyone else`s business."
Robert admits his hardcore fans can be quite overwhelming but he received a great tip on how to deal with fame from his `Remember Me` co-star Pierce Brosnan - who played James Bond in four movies.
In an interview with the Daily Mirror newspaper, he said: "We were in a restaurant and there were people looking over at us. They didn`t know who I was but knew who Pierce was and he went up to them and introduced himself.
"Anyone who looked round, he`d go up, shake their hand and ask how their evening was going. And I`d think, `What are you doing?` But it works fantastically because no one treats you like you`re a side show attraction any more.
"They don`t look around after that and they go home and say, `Well, he`s a really nice guy.` "