The Enemy Alpha Is My Mate?

The Enemy Alpha Is My Mate? I Am A Silver Blood Pack Member, I stand for my pack, I will follow the orders of my Alpha, I will never bring disgrace to my pack, I will never turn my back on my pack, I Am A Silver Blood Pack Member, I will try my best to be the best pack member, I will fight for my pack even if it means losing my life. I Am A Silver Blood Pack Member but why does my Mate need to be the Enemy Alpha?