There's two ways I'm looking at it at the moment. On a personal level, the love between the two seem to have almost vanished. There's lots of annoyances going back and forth, lots of little quarrels growing bigger by the day. I guess the newness has lost its shine, something like that or maybe reality has kicked in, however much they try to deny reality even exists.
At the same time, there's the level of running their empire and keeping up appearances seems to get easier and easier because the majority of her true fans have accepted him as Lord of the Manor. She knows dropping him now, with all the stress of missing accounts hanging over her head, would not just be an unwise move, but could prove to be fatal for her channel.