Should I tell the truth?

[Academic]

Wow. Such a pillar of "moral values"...

Yes, strongly encouaraging someone not to cheat in exams when they ask for advice is what I consider a moral position to adopt. In one of your earlier posts you have this to say

I'm sorry for advocating cheating, but i don't feel much good will come from telling on the lecturer bar stopping people who shouldn't pass the test, passing.
The negatives outweigh the positives in my opinion.

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You'll forgive me for not taking moral advice from someone who advocates cheating and thinks that saying sorry somehow exonerates him.

To the OP, if you're still interested, is there not a student welfare service run by the student union? You could perhaps seek advice there, having first demanded confidentiality, without involving the administration of your particular institution.