Not all toxic relationships are doomed to fail. If both partners recognize that the relationship needs fixing and they are both willing to walk the extra mile, then change can be possible. If both of you accept responsibility for your roles in the relationship and shift from blaming to understanding, hope is not lost. Seeking outside help could also give you a good shot at restoring your healthy relationship. Read more about mindful relationships here.
For those significant people on the outside looking in, they would easily suggest ending a toxic relationship ASAP. Some may suggest for you to leave when you can, otherwise, it may be difficult to escape over time. If you honestly feel that you are not only in a toxic relationship but in an abusive one, you might want to consider these ways to end the relationship.