I've been experiencing the singleplayer/alone phase of my gaming life...
I completed Tomb Raider (2013) just a few hours ago, and now I'm working on Far Cry 3. Plus a bit of State of Decay, Killing Floor, and CS:GO mixed in.
EDIT: Yay for the Autumn Steam Sale that just passed! That's where I picked up Tomb Raider, State of Decay, and FC3.