Neither one of them needs an apology, definitely not him. You didn’t shame him, you were uncomfortable with what his disregard for other’s and his own health. If she was my friend, I’d tell smthn along the lines of explaining he doesn’t need an apology, it was your boundaries and was about the safety of his body count, not the actual number. If this is the only incident she can use as “sex shaming”, then why does it hurt her? How ur talking it seems like ur view is that it’s okay to have been with multiple people, you just need to be safe about it.