After four very eventful years together, Robert Pattinson and Kristen Stewart are taking a much-needed break, a source close to Pattinson, 27, tells Us Weekly. Additional Pattinson insiders add that the British actor and Stewart, 23, have been “having problems” and “fighting a lot,” with things coming to a head on Pattinson’s 27th birthday May 13. Still, the first source adds that the much-scrutinized romance could go either way, and that a reconciliation is certainly possible. Just one week before the bitter birthday argument that led to the current split, in fact, the twosome were happily affectionate at NYC’s Cabin, where Pattinson met Stewart following her solo appearance at the Met Gala. Former child star Stewart met the British actor when they were cast opposite one another in 2008’s Twilight, the first of five blockbuster films based on Stephenie Meyer’s bestselling vampire book series. As the movie phenomenon exploded over the years, the twosome very, very slowly went public with their romance.