Dogs have a long memory, I had a dog previously who was scared and behaved agressively towards any person who reminded her our vet. I believe, in the evenings, when two people were sitting together, that was a usual situation when your dog was punished for some behaviour by the husband of the house. But, any dog's attitudes are very personal, your dog wouldn't have been scared of your husband only because he's a male, it was something which triggered his reaction.
Your dog's acute sense of smell could've detected something familiar, what he didn't detect in 3 months. A smell that reminds him a threat - that is what I put first on the list of possible diagnosis. It could be:
1. New perfume your husband wears;
2. Drink he didn't have since your dog appeared;
3. Food he ate last time,
I'd suggest you to use aromatherapy for dogs, say, a pine essential oil, it wouldn't be difficult (in fact it is pleasant and healthy) for your husband to rub some around his wrists, armpits and his neck after evening shower. He should try to smell nicely for his dog. Speak to him in a low voice (lower than his usual), whistle some melody before giving a treat (dogs like whistling), rough neck scratching is better than gentle head petting, share cheese slices (eat it yourself and train your dog to catch it), sit on the floor in front of TV in order to bring himself to the level of the dog, walk together in the evenings, ask your husband to interact with your dog in some play. - so to show him that your husband is not in any way can behave like that man.