My Alpha Cheated On Me with His Sister

"Damian, my destined partner, is the alpha that all wolf girls dream of.For him, I went alone to the North, his pack.But for three years after we signed the contract, he remained chaste, staying at least three feet away from me, refusing to mate with me.I thought he was just busy with the affairs of the wolf pack and had no time to care about me.Until I stumbled upon Damian pinning Lyra, his sister, against a rough tree trunk, his mouth savagely devouring her lips like a wild beast."You know I long for you, Lyra!" he roared."Why did you force that boring Selena on me?!"At last I understood. The only person he truly loved was Lyra.He hurt me again and again for Lyra, and even when we were trapped in the forest and almost swallowed by the shadow plague, he ran away with Lyra in his arms without looking back."Whether Selena can escape or not has nothing to do with me. You are the most important person in my world!"I was heartbroken, but he wanted to complete the final mark with me because of guilt.He didn't know that I had already dripped my heart's blood on the moonstone the day I found out about his affair with Lyra.Our mate bond had been completely broken long ago."