Every Star A Memory

It was a love at first sight kind of thing. The moment Cath sees him, it's over. Deep inside of her she knew something was wrong, something was not right. Somehow Noah gave her a familiar feeling, like she knew him before they even met. Then when he started showing affections for Cath, it just becomes weirder. Something was definitely up. After bothering Cath for such a long time, the truth comes pouring out when Cath finds her diary. Under her bed. Inside were events and memories Cath don't even remember. When did these happen? What is going on?