I would say that it would be highly unlikely for the wayward to fall beck in love with the LBS while there is any contact with the source of their addiction- the OP. My wife tried that early in her EA. She could have removed the OM from her work project, but was afraid that folks at her office might suspect there was something going on between them and she didn't want to risk embarrassment or termination. She agreed that she would have minimal, business only, contact until the project was completed and he was gone. I reluctantly agreed. I regret that decision deeply. It didn't take long for him to start charming her again and they went even deeper into the A (at that point I hadn't told his wife, there was no reason for him to stop). Of course, she continued to lie to me that there was no contact. I'd ask daily, and she'd say "nope, nothing!". What a fool I was.
My advice? There is no such thing as "unavoidable". If its this important, you move mountains to get her away from him. Move to another state if you have to. Don't wait, make it happen. If you have not already, let his wife know (if he's married). You'll need all the help you can to pull them away from each other.
