Why would it be surprising to a girlfriend or wife that the man she is with kept everything she has ever given to him?

So a few days ago, my wife and I were having this conversation, where she didn't believe that I kept everything she has ever given to me. This includes all of the letters, text messages, pictures, gifts, cards, even things like ticket stubs for concerts, and movies.

When I showed her she was surprised. I told her that to me everything I kept represents a memory, and when I get older, I wanted physical representations of the memories we shared. She said she had no idea I kept everything.

Is that bad? Why is it so surprising? She's important to me, and by extension, everything she has ever given to me is important to me.
Why would it be surprising to a girlfriend or wife that the man she is with kept everything she has ever given to him?
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