In her first interview since husband Bruce Willis was diagnosed with frontotemporal dementia in February, Emma Heming struggled to hold back tears. “What I’m learning is that dementia is hard,” said the Make Time Wellness founder, 45, who shares daughters Mabel, 11, and Evelyn, 9, with the 68-year-old actor. “It’s hard on the person diagnosed. It’s also hard on the family. And that is no different for Bruce, or myself, or our girls. When they say this is a family disease, it really is.” Though he has a team of doctors and specialists giving him therapies to help with daily tasks and memory, says a source, there is, sadly, no cure for FTD. Bruce, who’s also dad to daughters Rumer, 35, Scout, 32, and Tallulah, 29, with ex Demi Moore,…