Found out my roomate's GF used to be a mega-ho

[benza13]

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Since this doesn't seem to be a Super Classified Secret, I think you should take her off to the side and let her in on what everybody (except apparently Joe) "knows" about her past.

Tell her you aren't going to tell Joe, but one of your friends might let it slip after a few too many.

Then let it drop.

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Pretty much just what I was going to say. You get it off your chest and hopefully clear up the situation between them.