Ambrose later became Prudence’s prisoner when he was framed for killing the Anti-Pope, and her willingness to please Father Blackwood after he allowed her to take his name erased any will to make that stay comfortable.
The two eventually came together again, and were seen amongst the group who stopped the Dark Lord.
Ambrose and Prudence had a weird relationship throughout Part 2, which started with a brief romantic affair during the holiday of Lupercalia.