The 'Perfume' hitmaker, who has sons Sean Preston, nine, and Jayden James, eight, with ex-husband Kevin Federline, reportedly decided to end her romance with the producer in June because she wants to have a bigger family.
A source said: ''The beginning of the end was when Britney told Charlie that she wanted to have more kids. His career is red hot and so is Britney's. He told her he didn't know if there would ever be a right time for them to take a step back and become parents.
''Britney wanted a bigger family, but Charlie wasn't ready for that kind of commitment. It was make-or-break time for their relationship.''
But the blonde beauty, 33, believes she will eventually meet her Prince Charming.
The insider added to Life & Style magazine: ''She just wants to find someone who wants all the things that she wants in life.''
The singer previously said she felt ''very blessed'' to be in a relationship with Charlie, 32.
She said: ''I'm the happiest I've ever been. I'm in a real good place. I'm very blessed.''
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