You and Xiao were two different people.

You are a demon while he is an adeptus who banishes demons.

You were afraid that your inner demon would go all out and not be able to control it.

You were afraid to be banished away for a thousand years...

As you were walking around the school campus with Xiao, you heard a loud ring in your ear...

It was really loud that you covered your ears...it was really annoying and your ear wouldn't stop ringing.. something was wrong.