Watching a show with someone who doesnt watch but reads spoilers?

I hate spoilers. Ive been watching this show thanks to my sister since its first season. At first it was something she forced me to watch, then i grew to love it. I'm binging the latest season now, still hasnt finished, but a friend of mines is interested in the show. At least for conversation sake. I told him I'd share my streaming password so he can watch it with me, but he's already seen how it ends thanks to the internet. Even worst is that he keeps trying to ruin it for me when i say i dont want to know.

"Lemme give you a hint". I dont mean to sound mean, but i find it so annoying. I just wanna watch it alone now, but his feelings get hurt, then he does it again. I think maybe by accident sometimes💀. Im thinking I'm just gonna watch it first alone, finish the season. Then when we watch it together I'd just act surprised, but why do ppl do that?? Be interested in watching something but then watch the spoilers to see how it ends??