It happens to everyone. Discord might be signalling the end of the relationship. But turning away from conflict is turning away from reality. Denying anger, until it explodes unexpectedly at a later date, is bewildering and potentially very damaging to a relationship. Dealing with it as directly as possible, when it is happening, is strengthening though it may be painful and frightening to do so.
Fighting is a necessity in a thriving relationship.
Fighting fairly and to the finish is essential to the continuing growth of any partnership. Unfinished fights are usually aborted because of fear of losing or fear of exposing hurt feelings or concern over letting go of one's emotions totally. Most of us have experienced all of these fears at one time or another. But unfinished fights leave the participants tense and anxious. If you feel that way when you stop fighting, your fight is probably unfinished.