One Direction’s Louis Tomlinson has reportedly ended his relationship with his longtime girlfriend Eleanor Calder.

Louis Tomlinson, Eleanor Calder Split

“Louis and Eleanor split up two weeks ago,” a rep told to People. “They have not announced this as they wanted some privacy during this time.”

The reason for the breakup, according to a friend of he 23-year-old singer, is the lack of time the two were actually able to spend together. While Tomlinson tours the world with One Direction, keeping away from England for much of the year, Calder remains in Manchester, England, where she studied at the University of Manchester.

“Louis is really upset about it all,” the friend told People. “They tried really hard to make it work but it was just impossible, he’s away for nine months a year and they just grew apart.”

Calder, 22, apparently made a last effort to keep the relationship alive earlier this year, traveling to Australia to see Tomlinson.

“Cracks were showing for a while. It’s incredibly tough with the boys being on the road so much,” a source told the Mirror. “They had a month off over Christmas but since then they have been in Australia and the Far East.”

The insider added, “It put a real strain on the relationship. But even after Eleanor flew out to visit Louis, they couldn’t work through their differences.”

Tomlinson and Calder had been dating for around four years.