Initially, I feel badly for the sub (not sure what's going on with the Domme), but I don't feel like I have enough information to know what really happened. Of course, we are only hearing his side. We have no idea what hew may be omitting -- intentionally or unintentionally.

The main problem I see is that it doesn't sound like the scene was negotiated. Who goes right into a pro scene -- paid for or not -- and just starts doing things? Especially, if he account of the scene is accurate, some kind of psychoemotional play which can effect people's self-esteem? Recipe for disaster.

It's possible that the guy misrepresented his intent and/or the Domme misunderstood his intent and started feeling something for him, and when he said he had a girlfriend she felt betrayed and it came out in the session.