Foresight:

Naomi is able to tell the future to a certain extent. She is able to watch the decisions of certain people, but her visions changed depending on what the person decides.

These visions happen randomly and it only gives her fragments of what's going to happen.

The reason she didn't see that her two previous relationships were going wrong, was because she thought that they'd change their decision and her future would be different.

And because she's only given fragments of it, she can't always decipher what they mean.