Sienna and Balthazar—Over?

Sienna Miller has returned to London—and her hard-partying lifestyle—amid reports that her adulterous affair with actor and married father of four Balthazar Getty is finished. According to a aource:

“Sienna is back in London to give them both some cooling-off time. They are still together at the moment  but she has said things aren’t good. There have been some pretty unpleasant rows, largely over Balthazar’s reluctance to commit. She has really wanted to be able to step out as a couple but Balthazar is very torn over his children and it looks like he might be wanting to go back to his family. Sienna is devastated.”

It’s also reported that SIenna likes to go out drinking and partying all night while Balthazar, a recovering alcoholic and drug addict, prefers quiet evenings with friends. Hmm—why does this not sound like a match made in Heaven?