Chris Martin was "hard to live with" before he split from Gwyneth Paltrow.
The former couple - who have children Apple, nine, and Moses, eight, together - split last month after 10 years of marriage, and insiders claim the Coldplay frontman's insecurity caused a lot of their problems.
A source told Britain's Grazia magazine: "Chris is very tough on himself and that can be hard to live with. There was a time a few years ago when there were a lot of fights.
"He and Gwyneth had a great life but it was like he couldn't quite see it and couldn't commit to it. There were other issues that sparked off that and, ultimately, they ended up leading very different, very separate lives."
Now they have gone their separate ways, Chris and Gwyneth both want the best for one another.