Why is Ramsay torturing Theon?

Ramsay brings “Reek” to his father, who quickly becomes furious with Ramsay for torturing and mutilating a valuable hostage. Roose explains that he wanted to use Theon as a bargaining chip to rid the North of Iron Islanders, and for that he needed him unharmed.

Who is the person torturing Theon Greyjoy?

As an adult, Theon was arrogant, cocky, and proud until being imprisoned by Ramsay Snow, who is the eldest and bastard son of Roose Bolton. During the imprisonment, Ramsay severely tortured and abused Theon physically and psychologically and forced him to take the name of “Reek”.