Re: ingrate deceivers
If his intentions of deceivng were bad:
Wouldn't let him know that I know he deceived me. Would just make sure he isn't able to deceive me later. Ofcourse then he would himself come to know indirectly that I know he deceived me before.
If his intentions of deceivng were NOT bad:
I still wouldn't try to let the person know that I know he deceived me. Would just try to find out through the sources available to me, "What were his intentions of deceiving?"
If the person is someone very close to me
I would like to discuss the matter face to face to sincerely understand the reason which might have forced the person to deceive me.
p.s. May Allah forbid any such test to take hold of me. If such test is written for me, may Allah bless me with wisdom and strength of dealing with it in the best way possiible