Hello Kitty does not have a boyfriend. She is a fictional character created by Sanrio, and her creators have never established a romantic relationship for her.
While Hello Kitty has many friends, including Dear Daniel, Mimmy, and Keroppi, her focus is on friendship and love for her family and friends.
It is important to remember that Hello Kitty is a children's character, and her stories are designed to promote positive values like friendship, kindness, and imagination.