Because we're gluttons and we need to stir the pot a little. Shake them up!
He let out a heavy sigh and nodded. She couldn't see him nod, but he added a "yeah" onto it and gave her shoulder a gentle squeeze before letting go and stepping back.
"I think I'm still gonna go. I need some fresh air. I'll see you tomorrow, Bones. G'night." He headed for her door and opened it. He gave a longing glance back at her before he stepped out the door and shut it behind him.