You are not alone. I was with my BF/fiancee for nine years until he died. We would visit his parents on holidays and in their hallway was a picture of my BF and his high school GF that he lived with for a year or so. That was fine to keep her picture on the wall but his family never did hang a picture of me with BF. Whatever. It's annoying but if your relationship with your fiancee is good I would just ignore it. IMO