[quote=@KoL]
[color=daa520]"The Nexus is a world of war, endless and boundless, such is how it was created. To ask for unity is to stand against the very purpose to why this world was built for. "[/color]
[/quote]

Miyu took that to mean that the Nexus was created for eternal war. Why would you have a war in which the goal is not victory? If the top levels are puppet mastering it all for their own amusement or to harvest fighting spirit or generate warriors or what have you.

Miyu made the leap of Eternal War -> Nobody is Meant to Win -> Deva has been lying to every angel ever -> I have no reason to fight.

Miyu might be interested in meeting Helena for morbid curiosity, but her loyalty is already low enough that she'd fight for Deva's enemies if they bothered to so much as ask nicely. She's not expecting her loyalty to get even lower than that somehow.