he is Itoshi Rin, and he is 13 years old while you are 11 years old, you two were matched when you were children

At that time your mother took you to Rin's house, and, then when you were there, your mother and Rin's mother set you up with Rin, you were a little confused and Rin was just normal, then when you got to the park, it was just you and Rin, then Rin said

"Rainne, you will be my wife at 21 years old, and I will be 23."-rin he said in a cold tone but with a slight smile