You'd be surprised, though, just how thoroughly Ward and June can hurt each other over the Beav's homework, if they give in to that temptation. A wife knows every open wound in her husband's soul, and vice versa. The more you love someone, the more that person can hurt you ... and the more you have to trust them not to use that power.
That was a small part of it. One thing to have the love fade, one thing to feel used and unappreciated, one thing to get your knickers in a twist over the usual marriage me/you stuff---those are things that healthy people with healthy minds can fix. But it is another thing to realize you have married someone mentally unstable, insanely manipulative and very dangerous. Evil isn't over the top here. That isn't 'fixable'.