what possibly can unforgiveness lead to?

1) hatred
2) resentment
3) bitterness
4) grudges
5) revenge
6) broken relationships
7) escapism

and the list goes on...
Is there anyone whom has undergone any total breakthrough or healing under God's grace and forgiveness? Is there any chances stand for a once broken relationship before? I mean earthly relationship.

I am completely agree to what a friend of mine told me. Not to be too emtionally involved now as i am going to sit for my finals soon. Alright, i guess whatever it is now, i just set it aside first and settle it sooner or later.

This nagging pain still lingers.