“Alas! they had been friends in youth; But whispering tongues can poison truth;”
Coleridge summarizes how rumor and hostile speech can turn an old friendship into estrangement even when the original bond was genuine.
Source details
Christabel, Part II, reviewed against the scan-backed 1816 first-edition transcription on Wikisource. The narrator's 'friends in youth / whispering tongues' stanza explains the broken friendship of Sir Leoline and Lord Roland; the passage is Romantic narrative poetry about estrangement, not empirical relationship research.