Leviticus 26:44

Yet in spite of this, when they are in the land of their enemies, I will not reject them, nor will I so despise them as to destroy them, breaking My covenant with them; for I am the Lord their God.  

God keeps His covenant word!  God knows we are going to sin and come up short.  The covenant is why God sent Jesus to die for our sins when we confess our sins, and God is faithful to forgive.  God will not break His word and won’t leave us helpless.