The Blue Blood Alpha

A rejected mates, second chance, secret baby romance novel with a twist.
"I, Caden Knight, Alpha of the Mystic Falls Pack, reject you Lily Rose of Silver Moon Pack! From this day forth I release you from our mate bond".
Lily clutches her chest and falls to her knees trembling. The pain is excruciating, like her heart is being torn in half and all the air was getting squeezed from her lungs. She feels like she's dying. It's as though the mate bond is being violently ripped from her, leaving her winded and gasping for breath.
How had Caden gone from taking her virginity and professing his undying love only days ago, to rejecting her completely now?
"Nobody knows you are my mate, and nobody ever will! Everyone believes that Ava is my true mate, and that is what they will continue to believe. You will not breathe a word about us - do you understand?! Goddess-damn-it Lily this is important, say you understand!"
Was it only because of her heat that he had succumbed to her? Did he truly not want her? He never mentioned loving her best friend Ava during their mating, in fact he never mentioned her at all. Then Lily suddenly remembers the story Ava had told her, about her secret lover back at Mystic Falls pack, the one she admitted being with for eight years now. The penny finally drops, Caden must be that lover!
"You're the one aren't you? You and Ava lost your virginity together when you were both 18. You're not fated mates, so you took a blood oath bonding you together for life. You've been together all this time, she talked about you, but never mentioned your name".
Caden Knight is a blue blood Alpha, he has liquid gold running through his veins. His blood can cure numerous human diseases and is priceless, which means he carries a target on his back. What happens when he finds his mate, and what about the other female in his life, Ava? How can he protect the ones he loves from what he is?