Murderer Of Soulmates

Imagine a world, once human kind have evolved, wherein at the age of 18, you will stop aging if you find your soulmate.

Imagine you and your soulmate moving in together at age 18, and realizing at the age of 28 that you haven't aged a bit, or that you've spent ages together and haven't even realized it.

But then there would be people who would rather reign eternal. Imagine purposefully not finding your soulmate in order to live forever.

Griffin Skylark, the school heartthrob who seems to disappear every year and move to a new school, has a big secret.

Griffin twists the words of those and finds a way to get off the hook of being tied down. But the only issue is that he still wants to live forever. So there is the solution that he found.

Murder.
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Aurora Melena has gone through a lot in her life, leaving her depressed and lonely. She is forced to go to boarding school to be 'fixed', when she just so happens to meet Griffin Skylark.

Aurora wants to get life over with, so she can leave and go to a better place, with no intentions of finding her soulmate or becoming immortal.

She's scared and doesn't understand the cruel world she's raised in.

What are the two to do with different intentions, different worlds, and a different kill rate?

And will either of them make it out alive?