I feel sad about her husband but it was not your fault at all. Setting boundaries because you are married is good for yourself and your husband too. I just hope that her husband would learn to cook for himself or to eat outside for him to survive. And to your dear friend, I hope she knows that it was not a good request to cook for food for someones husband or to stay in their home cooking for her husbad. Hopefully, you and your friend will still be good friends.