Sure. I've kept stuff that reminds me of a time in my life - not particularly the person, but since there was someone else "in the equation", that means that "someone else" is also associated with the thing(s) I kept as part of "the story of my life". Some stuff I've kept as part of "the story of my life" isn't even about the good times. The story is the story. While I most often keep the nice reminders of one time or another, I've at times kept a thing or two from times I'd rather not remember (but that were a big enough thing in my life that having an small item or two from it means not completing "obliterating" the less-than-great times either.
The longer we're with someone, the bigger part of our "story" they've been. I think of what follows something that has ended as the end of a chapter, or even the end of a particular volume of a series of "books". We end chapters, or close one volume; and then move on to the next. I don't think that should mean having to rip out previous chapters or burn volumes we're already read or shared with "readers" (either us of anyone with whom we'd like to share our story).
The things I've kept are pretty much "just stuff" to me. They don't mean anything more, other than that they are mine and a part of my own, individual, story; which has all kinds of parts to it and which has made me the person I am to this point.