Would he have done it?

[Gurthang]

Originally Posted by Folwren

What's more, Eru or Manwë (whoever made the rule) wouldn't put Gandalf or any other Istari into that possition - break the rule or be the cause of Middle-Earth's ruin. It's simply not fair.

Who says that a Hobbit or a Man or Gandalf (or even Manwe) has the same sense of 'fair' that Eru does. What Iluvatar does cannot be judged wrong or right by lesser beings, it is right by the nature that Eru is the Creator and therefore always right. But I digress...

As to Boromir's question, I'd like to think no, he wouldn't have ever taken the Ring. In the Fellowship, he does not take the Ring, because he knows he will be tempted to use it. This shows, to me at least, that he would not have used it.