Sources familiar with the situation tell TMZ, Swift called Calvin from Nashville at some point after his car crash to pull the plug on their relationship. We're told Swift was vague during the call, only saying she needed some space.
Calvin was thunderstruck because he was under what he thought was a clear impression that Taylor was in it for the long haul to help him recover. He didn't accept the news well ... we're told they haven't spoken since.
And get this ... Taylor put Joe Jonas on blast on Ellen's show back in 2008 ... when she called him out for an over-the-phone breakup.
Pot, meet kettle.