Demi Moore and Ashton Kutcher's Fighting Was 'Intense,' Says Source

By Aili Nahas and Dahvi Shira

Friday November 18, 2011 03:30 PM EST

Ashton Kutcher and Demi Moore

Florian Seefried/GC/Getty

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Demi Moore and Ashton Kutcher announced their split on Thursday, but tensions have been building for some time.

"Ashton is unhappy; [Demi]'s unhappy," a source tells PEOPLE. "It just got to a point where they had to end it."

Despite longtime problems, the exes did try to work on their relationship. Unfortunately, their issues – which went beyond Kutcher's alleged infidelities – couldn't be resolved.

"The fighting could get pretty intense," an additional source says of Kutcher, 33, and Moore, 49. "Whatever counseling they did was fine for a quick fix but could not get to the heart of the problem."

For much more on Demi and Ashton's split, pick up the next issue of PEOPLE magazine