Majestic Hiss that's awful
I've kept some things, for example a series of photos of myself and an ex that I think are such beautiful photos of a young couple in love, there's so much fun & personality coming through them. I haven't spoken to the guy in 5 years and never will again but I value the memories of my youthful shenanigans.
However they are buried deep within an old hard drive, I'd never have them out in the open or expose DP to them!
Similarly, I never wear jewellery given to me by exs but I keep it at the bottom of my jewellery box. My previous relationships ended on good terms so I'm happy to have reminders of good times and good people.