Nothing, till I find something fishy to be really suspicious of!
Well, in this case, I'd make a direct confrontation to them both, and ask them for an explanation! Upon which either she leaves forever, or me does!
I would assume it was for another reason than to let him ream her in the bum.
Cut a *****.
I am not certain where you are going with this... but, she has her own place.....why old she want t use mine?
It would be weird but alright.