At this particular moment, Murong De was feeling extremely lucky that he hadn't listened to Murong Fei a few days ago to deal with Li Moying's fiancée.
If Li Moying could stay on in Celestial Light Sect forever, standing up for Celestial Light Sect, then what's the difference on whom he married? He originally wanted Murong Fei to marry him was exactly because he was afraid that Li Moying's wings would grow so strong that he would run away one fine day?
Now, Li Moying had already clearly stated his attitude.
Regarding Celestial Light Sect's matters, there was no way that he wouldn't care about it but Celestial Light Sect was not able to force him to do things which he didn't want to do.
Murong De wasn't silly as well so he knew that what he was referring to was his own marriage.