For talking about how their destined to be together and all that, he sure doesn't get along with her. Much like with the vampire world, Su Luxia is more or less just letting these assholes sleep in the bed they make.
And at the end of the day...everyone here's being a dick. He's being stupid and selfish, she's unbelievably egotistical and even more selfish, and mom is strangling it all with her pride while she chases her own petty agenda.
I'm pretty sure the only thing left is for Su Luxia to get out while she can before it all comes to a head with her bestie and the general getting together.