If a couple has chosen to keep their relationship, they will need to find hope that the damage can be repaired. Working with a professional might be helpful, but it is their own emotional equilibrium that will likely make the difference. If they see their partner is willing to do as much work as they are, then making progress in solving their issues is possible. Those who see their partner simply trying to pin the blame on them might just decide it is not worth their time or trouble to continue.
It can take gut-wrenching honesty to work through the issues keeping couple apart, so overcoming the obscuring factors can require a great deal of courage. Some people have it, both their partner might not. If they can compensate for this, they might still be able to reconcile. If their partner does not trust them enough to get past their own fear, then the relationship may eventually die.