"Got plenty of hope long as we got each other." He means the Killjoys, but he also means the two of them. If he's still alive, that means the others could be, too. She'd seen him die, so maybe it doesn't matter that he'd seen Party die. That's gotta be all the hope they need. They could all still be alive somewhere.

"Just gotta tie it real tight to you so you can't lose it anywhere."