Hi Katrina,
I'm so sorry this happened with your husband. However, having a brain disease he probably really didn't remember if you were married or not. I'm sure that bothers him terribly to realize he's not thinking clearly all the time. Don't feel hurt by it. Just take it as part of the disease that your poor husband has. The fact that you have been married for 58 years shows how much you both love each other. Rejoice in that. Not everyone is so lucky to have that in their lives.

My husband died of lung cancer a year ago. Towards the end of his life he exhibited some odd behavior. If I left the room he asked if I would come back. He worried constantly about being left alone. If I went to the store, when I came home he'd be standing in the window waving his arms all over. He was never that way before. My husband was a very active person who built beautiful things for our home, worked with electric tools, fixed anything that broke in our home or the neighbors. His cancer took all his strength and he could no longer do any of the things he used to do. That was very hard on him. Plus he had to have oxygen and nebulizers 24 hours a day just to be able to breathe. We were getting up 3 times a night because he would have severe breathlessness and needed to use his nebulizer which he couldn't manage alone. What helped us a lot was praying together every day and sometimes several times a day. My husband's kids from another marriage never came to see him even though they knew how sick he was. My husband said we were all alone. But I told him that isn't true. We've got God and Jesus and all the angels with us and we did. This helped us a lot until finally my husband went home to Heaven.
Katrina, just pray with your husband and ask for God's guidance. Remember the good times you two had and tell him how much you love him. Enjoy your time together. Too often it's gone sooner than you think.
I'll say a prayer for the both of you.
PML