An Artemis' Mistake?

What happens if you find your mate when you thought you had already? What if you have to choose between a guy that is everything you want, and one that is maybe just what you need?
Katherine found her mate already, Richard. Everyone who looks at them can see they are perfect for each other. He is this sweet, caring, awesome guy, and she is this calm, caring person that has a force within not known to many.
He treats her like a princess, and to her, he is her prince charming.
So... what happens when a new guy walks into Katherine's school, tall, dark and mysterious and confuses her feelings? He is like a brick wall that she can't get through, someone she can't read. Does she even want to?
People wait their whole lives for their soulmate, some may never find them, and Katherine has two!

Did Artemis made a mistake?