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[Part of him wants to say goodbye, but walking away is so much easier. No more thinking about them or what could have been. This life wasn't real anyway. Everyone's going to leave or die eventually. He'll be back home soon enough anyway, he's sure. Back to the life where he doesn't have time to think or strip or get a girlfriend in a nice apartment in the city with showers and food every day. He's been adjusting to this world, but not fast enough.
Plus, these girls aren't used to saying goodbye. It'll only make it harder for them to move on the way he will. He'll stay off the network. Retire his tablet. Work quietly at Beacons and come back to whatever shack his group and him find. Lily and Cori will cry for a while, but soon they'll find new friends. Isaac, maybe. Someone who won't hold them back from finding new friends. They'll drink wine and eat nutella until they find their next group... or they won't. They'll be stronger next time. Not feel trapped by their need to protect people that don't want or need saving. They'll find people like them who are just fine in this world.