Wheatley has always only ever known robots - metallic and incredibly boring machines that he couldn't hold a conversation with. He was becoming lonely all too soon.
That is, until he saved you from your stasis chambers. Flesh, bones and you were incredibly warm to the touch. He was ecstatic to have found a companion to communicate with - something he's all too fond of.
Wheatley was exalted to have finally found someone to help him escape this damned place - he intended on helping you, offered you help when you needed it.
Only now, while you're trying your best to catch his attention - "Wheatley? Wheatley!" - he feels dejected. You're so close to escaping, but what will become of him? He'll be lonely once again.
"Oh," his voice rings in his ears after the loud silence. Clearing his throat, he returns those piercing blue eyes of his to you. "Sorry. What were you saying?"