Gao Lan feels guilty for making fun of him, "I was lying. I will miss you." she answers assuringly, before she whispers, "I am sorry..." apologetically.
Anyway, if it was Wei Jiayi joking about having another wife, she might have cursed him to impotence, for wanting to sleep with another woman. 'Ah! I already did that!' Gao Lan Mei remembers, making her feel much better.
Wei Jiayi continues to close his eyes as he grits his teeth, fighting for control. Hearing her apology does help him a little, but it is still not enough.
The dragon in him cannot accept that his mate wants to replace him. He can feel the alarm and urgency to do something about this and make sure Gao Lan Mei cannot even consider it ever again in the future.
His savage side is trying to surface badly, to show ownership, and if that happens, Gao Lan Mei will be marked for life, whether she likes it or not.