The 36-year-old actor reveals he often felt the "Twilight" star did not like him, reported People magazine.
"I wanted these relationships to evolve naturally on screen, through the work. I don't think I said more than ten words to Robert off camera.
"I didn't know if he was just 'in that zone' or if he genuinely didn't like me. There was a real distance between us," Hunnam tells Screen Daily.
"He's reached out to me subsequently, making overtures for us to be friends now. So I think it was about the work," he says.
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