just keep them, their your photos you can do with them what you want.
though out of respect, don't leak them on the internet and make sure the files are encrypted.
And finally, when you are ready to let go like when you find someone new, you can perhaps delete them as your own little moving on ceremony.
until then, I don't see any harm in keeping the pictures, it's not really hurting anyone.
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mm...sex is fun
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