I'm going to tell my friend I don't want to watch TV with her
What's your reasoning for not wanting to watch TV with your friend?
Me and her don't have the same interests anymore so being friends is getting boring for me
People can grow apart or no longer put equal effort and care into the relationship. Talk to your friend and see if there is still something there worth saving.
No, I'm going to hurt my friend's feelings just because I can.
Sometimes friendships come to a natural end, but you shouldn't hurt them just for the sake of doing so. If you want to end the friendship then I suggest talking to them and letting them know your feelings and handle it in a mature manner.