• Emma Heming Willis says she mistook Bruce Willis' early dementia symptoms for marital issues. • "Conversations weren't really aligning anymore, and our relationship started to shift," she said. • Last month, she revealed she had moved Willis to a one-story home nearby where he has round-the-clock care.

Before Bruce Willis was diagnosed with frontotemporal dementia, Emma Heming Willis says she mistook his early symptoms as a sign that their marriage was in trouble.

"It's very gray to know where Bruce stopped and where his disease kicked in. I started noticing his stutter started to come back, but I never in a million years thought that was a symptom of FTD," Heming Willis told People in an interview published Thursday.

Their relationship started to change, in part because they were

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