I'd be perfectly happy with a negative from her, my boyfriends wife, but she just started sleeping with this guy. I have asked my husband to get tested, he just hasn't yet. Yes I'm fine with my partner or his partner getting an additional testing done without asking this guy, I do agree he is far removed from me.
I don't think my feeling is out of the ordinary because a previous partner of my metamour was concerned when I myself wasn't tested yet, but my BF HAD been since he started sleeping with me (then I went and got tested)
keep on keeping on