"J'ai été marié par un juge. J'aurais dû demander un jury."

Simplified Meaning:

This quote is saying that the person feels their marriage was like a trial or a serious judgment, and they regret letting just one person, the judge, decide their fate. They think that having a group of people, like a jury, to consider their situation might have led to a better outcome. Imagine you are in court for something important and only one judge decides the result. If they make a mistake, you can't do much about it. But if there is a jury of several people, there's a better chance that at least some of them will understand your side of the story. This person feels that one person's decision may not always be fair and wishes others had a say in what happened. In real life, think about making a big decision, like choosing a school. If only one person tells you where to go, you might end up unhappy. But if you talk to many different people who know you well, like your family and teachers, you can make a better choice. The same idea applies to the quote: the person thinks hearing more opinions might have led to a happier marriage decision.