Trauma, Life, and disappointments cause the heart to grow cold, bitter, and in need of repair. God is the only one who truly heals it - but you have to allow it. 

1Cor 13:4-8

4 Love is patient and kind; love does not envy or boast; it is not arrogant 5 or rude. It does not insist on its own way; it is not irritable or resentful;[a] 6 it does not rejoice at wrongdoing but rejoices with the truth. 7 Love bears all things, believes all things, hopes all things, endures all things.

8 Love never ends. As for prophecies, they will pass away; as for tongues, they will cease; as for knowledge, it will pass away.