to betray someone who trusts you
信頼している人を裏切る (shinrai shite iru hito o uragiru)
"I can’t believe he stabbed me in the back after all I did for him."
"彼のためにこんなにたくさんのことをした後で、彼が私を裏切ったなんて信じられません。" (Kare no tame ni konna ni takusan no koto o shita ato de, kare ga watashi o **uragitta** nante shinjiraremasen.)
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The ability to make money or succeed in everything one does.
a time of calmness and tranquility
to be independent and self-supporting
to form groups of two
to become involved in order to help or stop something