"Come and see a man who told me everything I have done."
Jesus knew everything about the Samaritan woman at the well (St Photina, feast on March 20th and buried in the Basilica of St Paul outside the walls of Rome). When she referred to her irregular marital situation, our Lord shows that he knows all of her sins - and desires to forgive her, giving her the living waters of repentance unto eternal life.
We discuss the importance of naming and numbering our serious/mortal sins when we go to confession. To intentionally hide a mortal sin (or to intentionally hide the number of times we have committed a mortal sin) would cause the confession to be invalid, and only add yet another mortal sin upon our soul - a sacrilegious confession.
Jesus already knows everything we have done! He knows everything we ever will do! And he still loves us! We do not need to fear! There is no need to be ashamed! The Lord Jesus will give us the living water of true repentance - because he loves us, he will bring us to eternal life.
Listen online [here]!