I have had this same dream for years. It involves my husband that passed away. In my dream, my husband is in the store he owned and instead of me being in the store with him, it is my friend. It is as if they are married and not him and i. I have dreams of my husbands who have passed away. I don't understand why I am having these dreams.
Maybe there are things about your friend that remind you of how you were when your husband was alive. Maybe you feel that his death has changed you.