> If you're living in a place in which you are not happy, with people you don't like,
The epiphany happens when you realize it's probably not the place or the people who are making you unhappy, but yourself and your beliefs.
That's what "wherever you go, there you are" means. It means you can't escape your self and you have to confront who you are no matter where you physically are.
This person is avoidant. That means when his wife did things rather than having an "us vs the problem" mindset, he is looking for the door. That means the woman over time will come to understand that she's not good enough, or there's an expiration on their time together. This raises the stakes for even small disagreements and creates a self fulfilling prophecy that ends the relationship.
So he hurt her by not being attached, and she acted in ways that made him unhappy as a result.
It was him ultimately that created his own unhappiness.