Trading, you can look at candlestick charts.

Buying a house, you can calculate the return.
But getting married, what do you use to evaluate?
Human nature won't be written in contracts.
Emotions won't be disclosed in advance.
The future won't provide you with backtest data either.
You think you're choosing a person, but actually you're binding yourself to:
The other person's family, values, emotional stability, and decision-making in extreme situations.
If you choose wrongly, you're not paying with money.
It's time, energy, and even your entire life path.
And the most brutal part is:
You might realize the mistake when it's already too late.