"You have shown me the ugliness of continued existence."

[etony33]

That sounds like something Zio or Rulakir would say, not Hugh. It's really nihilistic and seems out of place.

[SmashTheElder]

I took it as showing how extreme his disgust with the villains is. That they're so horrible, it's completely shaken his love of all lifeforms. But for what it's worth, the original Japanese line means this:
"You showed me the ugliness of living. But we’ll never forget the beauty of life!!”