I'm not sure he planned to top himself until the socks. What he saw as a betrayal was one thing, not living up to his responsibilities (albeit involuntarily) was another, but the socks, if you'll forgive my phrasing, are what I think pushed him over the edge. The final point seemed to strike him particularly hard on top of everything else, and everything he was crashed down in that moment.
Great episode all in all, damn sad ending though. Eddie was one of the rare sympathetic characters in the show.