"It is prudent never to trust those who have deceived us, if only once" - true?

I'm doing an A Level philosophy course covering Descartes, who said:

"It is prudent never to trust those who have deceived us, if only once"

While doing the course I happen to be reading A D Nuttall's "Shakespeare the Thinker" which has led me to try reflecting on comparisons between Descartes and Shakespeare, and in particular what Shakespeare might have made of Descartes' remark.

So I'm trying to think of examples from Shakespeare where someone is trusted after first deceiving.

Deception occurs frequently in Shakespeare of course, but are there examples of trust after deception, and did it prove to have been the right thing to do?

Forgiveness does occur in the comedies - often one of the women in a comedy will deceive the man - for example they will dress up as a man - and the man will forgive them and they will end up getting married.

Romeo deceives Juliet at the Capulet's ball and she forgives him - and I think we would say she should have done.

I'd like to hear of other examples though.