David was a military king and participated in his fair share of battles, but here in Psalm 55 he declares that the greatest threat is the backstabber in his own midst. Of course we all recognize that it is far worse to be betrayed by a friend than attacked by an enemy. It’s like getting sucker-punched. You don’t expect that attack vector. And it hurts. It hurts when someone we thought was a friend turns their back on us.
But even in the face of that reality, David says to give even these burdens to the Lord. No matter how betrayed and hurt you feel by what someone has done, even those concerns should be surrendered to God. He doesn’t want you to carry a heavy burden.