(PEOPLE.com) -- 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."





See the full article at PEOPLE.com.





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What has been building between the pair for a long time? How long had the troubles been going on? When did it end? What could get pretty intense? Who spoke of the tensions between Ashton and Demi?
tensions for some time. on Thursday, "The fighting a source
question: What has been building between the pair for a long time?, answer: tensions | question: How long had the troubles been going on?, answer: for some time. | question: When did it end?, answer: on Thursday, | question: What could get pretty intense?, answer: "The fighting | question: Who spoke of the tensions between Ashton and Demi?, answer: a source