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Dan Gasby is married to B. Smith, a TV personality in the US, who was diagnosed with Alzheimer's six years ago. When he posted a photo of himself and his new live-in girlfriend Alex Lerner on Facebook, a lot of people were unhappy, saying that he was being disloyal to his wife. Dan and Alex share their story. (Photo: B. Smith (on the right in red), husband Dan Gasby, and her husband's girlfriend Alex Lerner, (on the left). Credit: Getty Images)