We underestimate the amount of conflict there will be in any new relationship. Relationships bring out the best and the worst in all of us. Relationships can bring out the conflict within ourselves and direct it at the other person.
Love is real, but you’re not perfect, so you will mess things up sometimes. And people who love you will hurt you sometimes too. Harmony is difficult to maintain, because of conflicting ideas, expectations, needs, and desires. Minimizing problems, rather than total elimination of problems is a more realistic objective.