The Idol judge and Terri Seymour have ended their six year relationship, Cowell's representative Max Clifford toldPeople magazine in a Saturday report.
"Terri phoned Simon and finished it in September, about six weeks ago," Clifford told People. "They are going to remain close friends. Simon thinks the world of Terri and that isn't going to change. He also understands her reason for ending it."
Back in April, the U.K.'s The People newspaper reported that Cowell and the Extra correspondent had "drifted increasingly apart" due to Cowell's "obsession with work, his refusal to get married or have kids and his flirting with star-struck girls."
Clifford had dismissed the report as "a rumor that's been going on for the last year or so" at the time, however he admits Cowell's lack of a desire for children might have played a role in the breakup.
"In the past Terri has said that she wants kids but that just isn't Simon," Clifford told People. "[But] nobody else is involved, certainly not on Simon's side."
Clifford also toldUs Weekly the breakup "wasn't a shock or a surprise" to the Cowell and that he was doing "alright."
"They were together a long time and so you can understand that it's going to be a strange time," he told Us, before adding that the two had spoken since the breakup as friends.
However, Clifford also said that he didn't expect Cowell to be sulking for long, especially given his busy schedule.
"He has so much on, with a new Idol, Britain's Got Talent and the X-Factor so he'll be concentrating on [that]," he told Us.