The clue may have been that they spent New Year's Eve on separate sides of the country.
Now it has emerged that Olympic swimming champ Michael Phelps may have split from his longtime girlfriend, Nicole Johnson. The former Miss California celebrated the New Year in California, while Michael, 26, was spotted partying in New York with friends.
The New York Post newspaper is reporting that the swimmer is telling friends he is single.
Nicole, also 26, so far has kept mum on the subject.
The swimmer and the former beauty queen have been dating off and on for a few years.
The split is believed to be a recent one because in July Nicole flew to see him compete in the FINA World Championships.
So far neither Michael nor Nicole have spoken about the rumours and the swimmer's rep has not commented.
The Baltimore native is currently training for the upcoming 2012 Olympics, which are being held in London this summer.
Four years ago he broke records by winning eight gold medals at the 2008 Olympics.