You do realize that the TV show is based on the book, right? That's like saying you don't want to see Romeo and Juliet because you want the ending to West Side Story to be a surprise.
If you can read, read the books. If you can't read, have someone read the books to you.
I personally will almost definitely end up reading the books, but I can understand why someone would prefer not to. Even if the books are objectively better, they're also of a completely different medium. The person you're responding to is used to the beat of the TV show, the actors and their particular portrayals of the characters, and so forth. They're attached to this version of the story, and it's their preferred way of experiencing everything for the first time.
In other words, I don't think his preferences are invalid in any way.
(That's the last I'll say about that. I've just always found medium vs. medium elitism a little off-putting, and you came awfully close to that.
