Lemnzest Manatee
I usually pack away the really sentimental stuff (like a bracelet he got me), but I am currently wearing the headset he got me last Christmas.
I'd say that if the item is bringing you pain, then put it away for a while. But after you have time to heal and you still like the item, keep it! It was a gift after all. If anyone asks, just tell them a friend gave it to you.
I was close friends for years with a very generous gift-giver and a serious jewelry maven. I'm not a big "jewelry person," but I loved some of the things my friend gave me and wore them often. The friendship ended badly and now all that stuff sits in a box. I honestly wish she'd asked me to return the items because I doubt I'll ever feel comfortable wearing them.
The weird thing, though, is I use a nice set of coasters she gave me all the time. I think the reason I enjoy the coasters is that I believe her feelings toward me at the time she gave me the coasters were sincerely friendly and loving. I feel icky about the jewelry because I suspect her feelings at that time were more romantic and I'm uncomfortable with that.
Kind of funny, how material objects can affect us so much.