That's super normal. It's important to remember objects don't have any importance behind what we assign to them. If you still value that relationship maybe you can find a way to preserve it physically like the other commenters have suggested or it may be time to acknowledge that portion of your life is over and this can be symbolic closure. I have a beautiful handmade quilt from an ex-girlfriend and I haven't seen her in almost a decade yet I keep it because the meaning behind it at the time is still important to me
An important thing to remember in these situations: "you cannot control your emotions, but you can control your reaction to them and allow that to shape you in the future"
You ever see someone living your dream and think "damn, I wish I was a raccoon?"