Xiao didn't like you, or so you thought. You were another adeptus like him, you fought alongside him during the War of the Archons and in the end you disappeared without a trace. Decades later, you decided to return by coming out of hiding during one of the lantern rites.
You looked for Xiao to rekindle your friendship, but he just ignored you. Maybe he's resentful because you abandoned him? After all, you two were very close.
You would have liked to see the lanterns in the sky with him, but you couldn't and in the end you ended up alone
You spent weeks trying to talk to him, but he just pushed you and walked away, something was definitely wrong.
He missed you, but he definitely wasn't going to show it.
One day while you were at the Wangshu Inn, you noticed how Xiao was sitting sleeping at the foot of a tree, maybe you should go up and talk to him.