You are by nature my enemy. From circumsiances you became my friend. That state of things has gone away. The old but natural state of enmity has returned.
त्वं हि मे जातितः शत्रुः सामर्थ्यान्मित्रतां गतः॥ तत् कृत्यमभिनिवर्त्य प्रकृतिः शत्रुतां गता।