Then you should have died!
Died, rather than betray your friends,
as we would have done for you !
- J.K. Rowling

If I had to choose between betraying my country
and betraying my friend I hope
I should have the guts to betray my country.
- Edward M Foster

Betrayal does that — betrays the betrayer.
-Erica Jong

When a woman wants to betray her husband,
her actions are almost invariably
studied but they are never reasoned.
- Honore de Balzac

Et tu, Brute !
- William Shakespeare