Xiao fell in love with you. You were the one who let him know that love exists. But he loved you too much...

After a while, he realized that people are fickle and can die. So he made the decision to lock you up in his little world from where you couldn't escape. He never let you leave him or talk to anyone other than him. He completely removed you from people and now you were just his. He was afraid that you would stop loving him or other people would harm you, so he was always with you.