It does make a difference whether he was aware or not. If he was not aware, then this may be his true desires manifesting - albeit improperly - on someone who should not receive them, nor wants to. That can be confronted and end with a positive outcome.

If he is aware, and he is in fact aware, that changes things. Rather than lose interest and end the relationship, he has clearly decided to manipulate her instead. That's clearly abusive.

That too can be confronted, and certainly should be, even more so. However, that confrontation should be done with a restraining order after removing yourself from the situation, rather than confronting him directly on her own.

Because you are correct that she is not a psychologist, therapist, etc. And age difference does matter. On all of that that, we agree.