betray
be-tray
verb
To unintentionally reveal a secret, feeling, or weakness.
"Her nervous laugh betrayed her true feelings."
verb
To be disloyal to someone or something that trusts you.
"He felt betrayed by his closest friend."
Thesaurus
Synonyms: sell, fail, grass, tell on, shop, stag, shit, denounce, give away, rat, snitch, bewray
Antonyms: undeceive