Shadowland (The Immortals) by Alyson Noel

What's on the back of the book:
Even if you're Immortal
Can true love really last
Forever

Ever and Damen have travelled through countless past lives in search of each other. But just when their destiny seems finally within reach, a powerful curse falls upon them. A single touch of their hands, a brush of their lips will mean death for Damen - cast into the darkness of the Shadowland.

Then Ever meets Jude, a mysterious green-eyed golden surfer boy who understands magyck - and Ever - better than she does herself. She thought Damen was her destiny - but what if fate has other plans?

A piece from the book:
I shift my body so it's covering his, conforming to the bend of his chest, the valley of his torso, the bulk near his hips. Hearts beating in perfect cadence, vaguely aware of the slim veil of energy pulsing between us as I lower my mouth to his - pressing and pushing and kneading together - weeks of longing rising to the surface - until all I want to do is infuse my body with his.
He moans, a low primal sound coming from deep within, hands clutched at my waist, bringing me closer 'til there's nothing between us but two sets of clothes that need to be shed.
I fumble at his fly as he pulls at my tee, breath meeting in short, ragged gasps as our fingers hurry as fast as they can, unable to complete their tasks quickly enough to satisfy our need.
And just as I've unbuttoned his jeans and start to slide them down, I realize we've gotten so close, the energy veil was pushed out.
"Damen!" I gasp, watching as he leaps from the bed, breath coming so heavy and fast, his words are clipped at the end.
"Ever - I'm - " He shakes his head. "I'm sorry - I thought it was safe - I didn't realize - "
I reach for my tee and cover myself, cheeks flushed, insides aflame, knowing he's right, we can't take the risk - can't afford to get caught up like that.
"I'm sorry too - I think - I think maybe I pushed it away and - " I bow my head, allowing my hair to fall into my face, feeling small and examined, sure I'm to blame.