Guys - why would you keep an ex's bra?

So a guy I used to be involved with asked me for one of my bras the last time we did it. I asked why because we weren't and still aren't on good terms (primarily because of me, I'll admit). He said it was for a keepsake of me but long story short, I assumed he wouldn't want anything to do with me. There was no cheating or anything like that, just communication breakdown and boundary crossing.

So guys, why?

Guys - why would you keep an ex's bra?
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