How does sir gawain and the green knight embodies the code of chivalry?

He wanted to see if they were as tough as he had heard, so he challenged one of them to chop his head off with an axe. Then, in 11 months from now the same man would come to the Green Chapel, and he could strike him once on the neck as he had done to him. Sir Gawain/Gwaine took up the challenge, and set out in 11 months. He stayed in a castle, where the lord struck a deal with him: when the lord went out hunting, he would give everything he caught to Gawain. In return, Gawain must give him everything he comes by at the castle. The lord's wife falls in love with Gawain, and on the first day, kisses him once. Gwaine kisses the lord once, keeping the deal. On the second day, she kissed him twice, so he again returned the kisses. But on the third day, when he was to be on his way to the Green Chapel, she gave him a hand-woven belt as a How_did_green_knight_challenge_arthur_and_his_knightsof her love. It would keep her safe, she said. Completely forgetting the bargain, he left with the belt on underneath his armor. When he reached the Green Chapel, the Green Knight was waiting for him. He swung his axe, but did not touch Gawain. He swung it a second time, and, again did not spill any blood. But on the third time, he cut the neck, just deep enough to spill blood. The Green Knight was really the lord from the castle, and was testing, no only the bravery of the knights, but the nobility, their truthfulness. He struck him only once on the third swing, because that was when he had broken his promise - he had not given him the belt his wife had given him.

MORAL IS TO TELL THE TRUTH :D