Then Gawaine was so entranced by the lady Ettard's blue eyes and fair face that he shamefully forgot his word of honor, and warmly returned her love. He remained with her and her knights in the castle, so happy in her presence as to ignore all the claims of duty and knightly faith.
It was now the month of May, and the air had grown warm and balmy. So it happened one evening that they all left the castle to enjoy themselves on the flowery meads outside. Believing Pelleas to be dead, Ettard lost all dread of unwelcome intrusion, and suggested that they should spend the night in the open air, lulled to sleep by the soft winds and the perfume of flowers.
But by fortune it chanced that Pelleas, hearing no word from Gawaine, that night mounted his horse and rode to the castle. It was a late hour, and he was surprised to see pavilions erected outside the gate, and couches spread in the open air. As he came near he saw knights and ladies asleep on these, while side by side lay Ettard and Gawaine, locked in deep slumber.
Anger and pain so filled the knight's heart at this that he drew his sword to slay his faithless friend, but on calmer thought he laid the naked blade athwart the throats of knight and lady and rode away. On reaching his tent, he told his attendants what treachery he had endured, and that he had resolved to take to his bed and lie there till he should die.
"And when I am dead I charge you to take my heart and bear it to the lady Ettard in a silver dish, and tell her that her falseness has slain the faithfulest of lovers."
Meanwhile Gawaine and Ettard awoke, and their dread was great on finding the sword across their throats.
"It is Pelleas's sword!" she cried. "You have betrayed him and me both, for you lied to me in saying that you had killed him. Only that he has proved himself a man of true honor, he would have slain us both. Leave me, traitor! Never let me see your false face again!"
Gawaine had no words in answer, but hastily mounted his horse and rode into the forest, feeling at heart that he had proved a traitor both to honor and love.
When morning dawned it happened that Nimue, the damsel of the lake, who by chance had come into that country, met with a follower of Sir Pelleas, who was grieving sorely for the ill fortune of his master. She asked him the cause of his grief, and he told her the woeful tale of the lovelorn knight, and how he had taken to his bed, vowing never again to rise.