betray

The spy was executed after he tried to betray high-level military secrets to the enemy.

(Chinese) 这名间谍在试图向敌人出卖高级军事机密后被处决。

I felt deeply hurt when my best friend chose to betray my secret to the entire class.

(Chinese) 当我的好朋友选择向全班同学泄露我的秘密时，我感到深受伤害。