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I don't think Elon Musk ever completed the full cross country trip. On March 31, 2014, he tweeted that he had stayed at the Rocket Motel near Mt. Rushmore and mentioned a sudden blizzard affecting travel.
It's probably more likely Elon's work schedule. He's super dedicated to changing the world. This gives him very little time to work on relationships. Any normal human would crack under all that pressure.