<human>: We've been together for four years and this is the first year we've spent at her parent's house, where she grew up. We're very happy and I am her second long term boyfriend. We've both dated casually, and I've had a few longer relationships. Her first boyfriend and first anything was when she was sixteen and they dated for two years, but she dated casually between breaking up with him and us getting together. 

Her parents are strongly religious so they asked us to not sleep in the same room, and I'm sleeping in her old bedroom (I'm very tall and the guest bed is more of a cot). We were both reminiscing about the similar toys we had and talking about her childhood etc and looking through her room. There was a nice box up on a high shelf in her toy cupboard but before we got to it we were called to dinner. 

I don't know if it's snooping, but later by myself I looked in the box. I didn't think it was private at the time, we were going through all of her kids stuff in that cupboard and it wasn't that she said not to look in there, we just didn't get round to the top shelf when looking at stuff. But it was full of stuff from her first boyfriend, their prom photo, an album he wrote for her, souvenirs from a big trip they took together, ticket stubs, love letters etc. 

I don't know why she would keep this stuff. I haven't kept anything from past relationships and this is very strange and hurtful to me. I just don't get why she'd want to keep these things, it's been years and it makes me feel insecure.  To be honest I'm not comfortable with her having a box of mementos of how happy she was with another guy and all the stuff they did together, as well as photos of them together. I feel like I have to talk to her about this but I'm not sure how.

Give me the gist of the text in a nutshell
<bot>: accidentally found a box full of mementos and stuff from when she was with her first boyfriend. She's kept them for ages and it just makes me uncomfortable. How do I talk to her about it?