He was once my friend, but now he has become a betrayer.

The betrayers were exposed and faced the consequences.

He felt a deep sense of betrayal when he discovered his best friend had been lying to him.

There have been many betrayals in their relationship.

His betrayment was a shock to everyone.

There were many betrayments in the war.

He is a betrayable friend.

He betrayed his best friend by revealing his secret.

Thou betrayest thy friends for personal gain.

He betrayeth his friends for personal gain.