Was Lindsay Lohan The Cause Of The Breakup?

People has just confirmed tha Petra Nemcova and James Blunt are over.

While Petra's camp has no comment, the Blunt camp has this to say:

"They split in February. It's very amicable."

So, my question is, when did they actually split? Was it after the whole Lindsay / Blunt rumors ? Bet it was.