[He's about to sass out a retort until realising what he's about to blurt isn't the best thing to say after all. And it shows on his face with the hurt and guilt filled look he's got briefly enough on his face.

Saved his life when Jiang Cheng was captured after the massacre of their sect? The massacre was Wuxian's fault to begin with for playing the hero.
Saved his cultivation life by sacrificing his own Golden Core for him to have? That wasn't a very good conversation in the temple and he doesn't want to repeat it!

Instead he resorts to being a pain about the latter remark.]

I do too! Who ELSE would have known your dogs' names were Princess, Jasmine, and Little Love? AND that you threatened to send dogs after me when we were young!