This is not true for even the best entrepreneurs of our times...many are divorced multiple times so gambling on staying married is a bigger risk. Elon Musk and Sergey Brin are just a couple examples. Your spouse can dump you at any second no matter how secure you think your relationship is.

That's an example of entrepreneurship being hard on your relationship.

So if you go into a startup, you might end up with both a failed business and a divorce.

It's only tenacity, talent, and good timing that lead to Musk and Brin having the good luck to be divorced.... but successful.