Should I use my ex's Netflix?

I have my ex boyfriends Netflix password and I want to use his Netflix just cause it's there but I feel like I shouldn't. When we were together he said I could use it any time. He was cheating on me and treated me like I was nothing in the end. But I kinda wanna use his Netflix just to piss him off. I know this isn't a big issue and if it doesn't belong on eve you can report it or whatever. What do you think.. should I use it or not?