Betrayed

to deliver or expose to an enemy by treachery or disloyalty:
benedict arnold betrayed his country.
to be unfaithful in guarding, maintaining, or fulfilling:
to betray a trust.
to disappoint the hopes or expectations of; be disloyal to:
to betray one’s friends.
to reveal or disclose in violation of confidence:
to betray a secret.
to reveal unconsciously (something one would preferably conceal):
her nervousness betrays her insecurity.
to show or exhibit; reveal; disclose:
an unfeeling remark that betrays his lack of concern.
to deceive, misguide, or corrupt:
a young lawyer betrayed by political ambitions into irreparable folly.
to seduce and desert.
contemporary examples

messy legal rules and procedures make khalid sheikh mohammed trial doubtful terry mcdermott may 7, 2012
jodie foster blasts kristen stewart–robert pattinson break-up spectacle jodie foster august 14, 2012
rupert murdoch’s trouble has only just begun nico hines, peter jukes june 25, 2014
bradley manning’s betrayer, adrian lamo, testifies at pretrial hearing denver nicks december 21, 2011
masterpiece, icon of pbs, turns 40 jace lacob january 8, 2011

historical examples

the free lances mayne reid
within the law marvin dana
all sorts and conditions of men walter besant
the secret agent joseph conrad
the international spy allen upward

verb (transitive)
to aid an enemy of (one’s nation, friend, etc); be a traitor to: to betray one’s country
to hand over or expose (one’s nation, friend, etc) treacherously to an enemy
to disclose (a secret, confidence, etc) treacherously
to break (a promise) or be disloyal to (a person’s trust)
to disappoint the expectations of; fail: his tired legs betrayed him
to show signs of; indicate: if one taps china, the sound betrays any faults
to reveal unintentionally: his grin betrayed his satisfaction
betray oneself, to reveal one’s true character, intentions, etc
to lead astray; deceive
(euphemistic) to seduce and then forsake (a woman)
v.