Boredom is what happens when they "grow apart" and when there's a "communication breakdown".
You are the one choosing the word "boredom." You could have said "sadness, loneliness, isolation, resentment, frustration..." YOU chose the word "boredom" because that's how you see women's emotions. You don't see a woman whose husband isn't communicating with her as sad or lonely or frustrated, no, she's just Bored. That's your bias.
And before you say communication goes both ways, let's remember that no man has ever accused women of suffering in silence.