Co-dependent behaviors are very self-destructive.
When learning to become God-dependent we come to realize that God is our strength, our all-in-all. No one person will be able to satisfy your every need, nor will you be able to meet anyone else's.
God is the only one who will be strong enough to carry you through life. When we try to take on the responsibility of another person's life we play God. This is dangerous and destructive for the other person and us.
"My flesh and my heart may fail, but God is the strength of my heart and my portion forever." Psalm 73:26
"Blessed are those whose strength is in you, who have set their hearts on pilgrimage." Psalm 84:5
"If anyone serves, he should do it with the strength God provides, so that in all things God may be praised through Jesus Christ." I Peter 4:11