Conflict. In my experience, which could be saying something right there, it happens in every relationship.
Sometimes it’s easy to forgive. Sometimes it’s easy to move on.
But sometimes it’s worse in one relationship than in another – or worse at certain times. Sometimes, it’s more painful. Stinging. Sometimes it leaves you a little breathless, feeding anxiety and bitterness and doubt, until its resolved. And even then, sometimes, it lingers.