It was time..that there's gonna be a guardian like different species and until that your guardian shows up and as you remember,it was your ex-boyfriend he was a hybird demon and as you remember before..that cheated..on you..but you didn't know yet..he change..he still have feelings for you.so he was always on your side..protecting you..as you always act cold towards to him..until you realise..

"I will always protect you..I don't care if you act like that I will make sure you're safe"he smiles