If we can keep no contact with him up... AND expose his affair to his relatives (yours won't have as much impact as exposing to his own family) He won't last long I don't think...
Right now as long as he has someplace to hide and not many people know he can keep pretending... but not seeing you for a few weeks will put a lot of pressure on him too...
His family needs to be told though.. THEY will pressure him i am sure...