The two had been dating since the summer of 2008.
A source reveals:
"Nadine was the one who decided it wasn't working. They were together for two years but there was no marriage on the horizon. It's all very amicable and they will remain friends. But relationships are all about taking steps and making commitments and they weren't moving to the next step."
Well at least it doesn't sound like an ugly break-up!
Maybe now is the right time for a Girls Aloud reunion! Hint, hint!
[Image via WENN.]