Why didn't Galadriel warn Aragorn that Boromir wanted the Ring?

[Lotrelf]

Originally Posted by William Cloud Hicklin

Remembers Gildor's words: "We do not willingly give advice, for advice is a dangerous gift."

It wouldn't have been just an "advice", but the question of entire ME's safety. If it were just advice that needed to be given, she would have warned them. She had foresight, I'm sure. But that doesn't mean she used to be sure of all of it. As someone here explained the reason why She only warned the Ring-bearer.