Re: What would you do? (Older male teacher with young female student)
If the young woman in question was of the age of consent, then the conduct, however distasteful to me personally, was probably lawful.
ON THE OTHER HAND, if she was underage and their relationship was anything other than platonic, then we are discussing criminal and predatory behavior in almost any culture or jurisdiction. If that was the situation (and Angry Father isn't clear on this), his current relationship is irrelevant to his future behavior. These guys are on the hunt and stay on the hunt until they are stopped. Many, if not most, sexual predators I've dealt with over the years were in significant relationships and still continued to seek out victims. Allowing such an individual to continue training and teaching speaks volumes about that dojo and its' leadership.
Since Angry Father hasn't been entirely clear, I won't throw stones, but this situation has alerted my Spider Sense.