I was getting pissed off too, mainly because the motivations didn't make a whole lot of sense.
Eris said she'd come back when she's more "worthy" of him.
He knows he still has his teacher and his family. He was finding his mother. There's still plenty of motivation there to the point where thinking he'd just fall back into a rut seems... strange.
The burnt hand scene seemed strange. Not in regards to the handshake, but more the fact that it was burnt. I've never seen a fireball hurt someone's own hand before, and if you burnt your hand from skinning animals they're too hot.