A friend has claimed that the 'Thinking Out Loud' hitmaker's relationship is currently on the rocks and believes it "might have run its course".
They told the Sunday Mirror newspaper: "Things haven't been as good and Ed has just headed off on a world tour which will keep them apart for months.
"There have been a few fallouts and the latest seems to be more serious. It looks as though the relationship might have run its course."
The 24-year-old singer recently performed in Japan and China and is heading for Australia shortly.
He will visit New Zealand, South America, the United States of America and Canada before he returns to London for his three shows at Wembley Stadium.
The couple - who have been dating since last year - were said to have argued after the BRIT Awards in London last month, where Ed triumphed with two gongs: British Male Solo Artist and MasterCard British Album of the Year.
Athina, 23, is also believed to be upset after Ed's good pal Taylor Swift thanked him in her acceptance speech when she picked up the International Female Solo Artist award at last month's ceremony.
Collecting her award, the 'Shake It Off' hitmaker said: "I wouldn't be up here if it wasn't for one of my best friends, who took me to pubs and taught me how to make a good cup of tea and everything about the UK.
"I want to say, 'I love you, Ed Sheeran, wherever you are.'"