I've never heard of the Fade, but I bet we're talking about something similar. And - if not? I get the feeling.

[ She doesn't feel isolated, exactly, but Aerith has always had distance between herself and others, being the last of the Cetra. Maybe Cole is...alone like that, too. ]

"Now?" Have you started trying to talk to them a bit more than you did before? ...To be honest, though...it can be hard to use the right words in most situations. They're tricky!