>>212949748
They were both attracted by Griffith's power and presence and turned to each other in grief when he made it clear he intended to have neither of them and make moves on Princess Charlotte.
They were always just pawns to Griffith, because he cares for nothing but his own ambition, because he's an evil shithead. He feels guilty about it underneath the mystique but he doesn't slow down on enacting his selfish ambitions at all.