Melbourne, Mar 21 : Jennifer Aniston's desire to start a family is said to be the catalyst behind her and John Mayer's split.

The Friends actress and the Gravity singer reportedly ended their relationship over the singer''s unwillingness to father her child.

"She was truly ready to move on. John wasn''t ready to father her child so she ended it," The Courier Mail quoted a source, as telling America's OK! Magazine.

Mayer, 31, and Aniston, 40, are said to have ended their romance on good terms, and have not ruled out getting back together in the future.

Another source said: "They left the door open to give it another go. John''s number one priority at the moment is his music, it's all-consuming for him."

Aniston has previously spoken of her desire to have children.

She said: "I feel it''s in my future and I''m on the verge of it in some way. I want to have children. That''s my plan. Of course I'd like to be a mother some day, and I love children." (ANI)