What should you do if you find clothing of someone you used to date?

Doing laundry today I found a bra mixed in with my clothes. But the person who was wearing the bra has blocked me. Should I donate it, wait in case she wants it back?
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Ladies if you found out that I had donated your bra in this case would that seem logical? Think that’s my plan.
What should you do if you find clothing of someone you used to date?
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