Hmm... I wonder if I should worry about females being over reactive...
I tend to keep pictures of anything I enjoyed in the past and I quite frequently view them. I still have a graduation card from a friend of mine from 2005 as well as some pictures from that time and before. She was a good friend and I entirely plan to keep said items for as long as I can(as stated I still view them fairly often).
Also I don't hide things. So a GF of mine would probably run across all sorts of things from the past. My room is my den. Don't want to see my past, stay the hell out(though my den is so cluttered you would be lucky to find anything specific).
Though "Aww, are your silly female emotions playing tricks on you? I'm with you now, so get over it." is quite improper and should rightly result in an angry retort from your lady friend.