Cheating 🤦🏻‍♀️

So my husband has two cousins, both on separate sides of the family. So the male cousin is married and apparently has been talking to my husbands cousin on the other side. His wife is on Facebook so I don’t know why it’s even a questions but she asked my husband yesterday if said cousin was still with his wife. Anyway, I have access to my husbands account so I messaged her and told her yes because damn I don’t want her to be a hoe but if you can’t tell from fb then wtf... my husband was going to stay out of it and maybe I should have but what in the fuck. So now I’m wondering if I should tell the bastards wife. Should I? Or should I just keep it at that and keep it moving? I don’t want to be a bitch but cheating really? And it looks like girl doesn’t care he’s married. Help! Ty! Oh and no relation between the two cousins so it’s not wrong in that sense.