We were intending to invite a couple, that has now broken up. We sent an invite to the one we're closer with, because it was a bad break up and he indicated he would bow out if she was there.
So after the invite's been sent to him, he's accepted and booked accomodation and flights, we've learnt the girlfriend has already booked accomodation as well. I was a bit mystified because she never received an invite, but my FH indicated she was verbally invited last time they spoke.
Stuck between a rock and a hard place now. If we invite the girlfriend, it would be a huge betrayal of trust to the friend. But we don't want the girlfriend to lose money if she's already spent it.