Christmas Gifts

I hate it when I purchase things for my boyfriend, and he either already purchased it for himself, or his family got it for him for Christmas. This happened last year, and then again this year! Then, I have to sit down and explain to my boyfriend that he need to return the gift that was purchased from someone else, and keep the item that I got for him. Why does this even have to be a discussion...does everyone not know the relatiionship "rules". You don't return the gift that your "spouse" gets or you....it's offensive! It makes them not want to purchase anything for you again! So, return the GPS that they gave you, and keep mine's, OR ELSE!!!