In lines 464-477, how does Sir Gawain react when he considers his own actions?

Accured be cowardly and covetous heart!

In you is villainy and vice and virtue laid low !

then he graps the green gridle and lets go the knot ,hands it over in haste ,and hotly he says behold there my falsehood ,Ill hap betide it !You cut taught me cowardice ,care for my life And coveting came after ,contrary both to largesse and loyalty belonging to knights. Now am I faulty and false ,That fearful was ever or disloyalty and lies ,Bad luck to them both! and greed , I confess ,knight in this place most dire in my misdeed ler me gain back good grace and thereafter i shall take heed