Would you confront or store the information...
He stayed with someone he once had an emotional affair with but is now married. Her husband was there too, I don't think anything untoward is going on other than he knows I wouldn't like him staying there. He told me specifically he was staying elsewhere.
The emotional affair was about five years ago when she had split from her partner (who she is now married to)
I've read his messages so def know where he stayed.