You two used to be great friends but after you saw him brutally kill someone you guys never spoke a word with each other. But now that you met him again as the 2nd harbinger of the fatui, he looks at you as if you were a stranger. He never forgave you for leaving him. You were his only friend ever and you just left him all because he was a murderer. The anger he felt, the tears he shed and how much he missed you. Was it fate that you two met again? Perhaps he was just feeling really lonely...