I think it's good that he's being upfront about it. Sounds a much nicer way of meeting her than what happened to me. I came across my ex at the shops in a jewelery store with his new GF who he has been insisting is just a friend. I was shocked as he had cancelled coming to see our son that morning and I got really nasty. I would have much preferred to have met her in a nice organised way like you are getting the chance to do.