It is hard to imagine the depth of pain that people go through when it seems God is silent. Psalm 13:1-3 7 gives the impression of a protracted silence of God and suffering of David about the God’s silence. He sounds painfully drawn out. He therefore laments on how this perceived silence God affects his relationships in four areas.
But David makes a shift to focus on trusting in God in spite of the perceived silent. The most important being God’s unfailing love (chesed; 13:5). This expression, emphasized in the Hebrew, speaks of the continual and unending love of God, which is based on the relationship already established between Him and His people.
If the psalmist needed any proof that God took this commitment seriously, he could find it in a review of past blessings (13:6), for [God] has been good to me, the second reason for the psalmist’s trust
~John K. Amoah, PhD~