Relationships are never perfect!

Why is it thought that couples why hurt each other are a misfit or not "soul mates/perfect match" e.t.c.?
Friends show "concern" and you feel as if there may be something wrong with your relationship if it made you say and do what you have done or made your partner say or do what he has.
All relationships we have with those we love are about loving, hurting and forgiving each other. Again and again.
Mother and daughter, siblings at any age, close long-time friends,
-we all hurt each other occasionally, even hate each other for some time.
Misunderstandings, sometimes just the fact that we are human and make giant mistakes occasionally or sometimes just strain and circumstances that would be enough to have anyone a little tense.
When you have a huge fight with your loved one it's easy to believe that the relationship itself is a huge failure, and that there must be something wrong since you end up hurting each other all the time. (if icepicks,heavy tranquilizers, baseball bats and/or knives have been involved, it IS wrong and you should ignore this post)
But there are the same rules for man/woman relationships as for all other meaningful and rewarding human relationship.
We will hurt one another, because we love. And we must give space to the other to deal with anger, hurt and rejection at times. But if its forgiven and sorry is said, and you move on, that's what its about. Am I right?