I don't ask any questions about who or what she's done in the past with people that aren't here today. But if this man is actively in our circle, riding in the car together with us, going out with us, taking photos or planning trips with us then I would view her much differently if she didn't tell me and I found out elsewhere.
I think we may have to agree to disagree on this one. Ignorance isn't bliss in this situation.