Its seemingly guy code for your buddy to say go for it.... but then there's bros before hoes. You have to ascertain if its actually okay. Time, his status, length of relationship and depth of their relationship are good barometers if okay is truly okay. If its been years, you're probably okay. Weeks, not at all. Months... refer to the other indicators.
Personally, I'd say she's tainted and back away.
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