Demon protecter for a werewolf

I'm a guardian and I have been sent to earth to protect a werewolf who is in danger. The guardian solar hasn't happened in a hundred years and I have been chosen out of a thousand of our people. Yey and i also have found my mate which is Jason but I'm not supposed to have a mate and what happens when I have to go back to elsekwar and I have to make a decision stay with my mate or never see my family again?