A stressed-out Demi Moore can’t forgive Ashton Kutcher for cheating on her with Sara Leal and the marriage is over despite a last-ditch attempt at counseling.

Moore and Kutcher were already separated when the Two And a Half Men star cheated on her — on their sixth wedding anniversary!

“They’ve been in counseling,” a source close to the situation told RadarOnline.com exclusively. But when Ashton cheated with Leal in San Diego in the early morning of September 24, it dealt a death blow to the marriage.

“They separated about six weeks ago,” the source said. “Both went to Kaballah counseling hoping to save the marriage. But it’s over now.”Kutcher has been accused of cheating previously in the marriage. He denied hooking up with Brittney Jones last year, but has been quiet about his sexual encounter with Leal, who slept with Ashton in his penthouse suite in San Diego and then sent a text message to friends telling them about it.