My girlfriend suddenly wants us to do No Nut November together and it’s starting to make me feel weird about our relationship. What do i do?

I’ve never taken NNN seriously and always thought it was just an internet challenge. My girlfriend (25F) and I (27M) have a very loving, supportive relationship and intimacy has always been a natural, positive part of it. I’ve never had any issues around self-control and have a normal relationship with sex and self-pleasure.

This week, though, she brought up No Nut November completely out of the blue and said she wanted us to do it together. I laughed at first because I assumed she was joking but she apparently wasn’t. She said she wanted to try it as a couple and “see if it changes anything.”

At first, I thought it was just a joke and would maybe last maximum a few days, but it’s quickly started to feel off. Today we were cuddling and right when things started getting serious, she stopped and said she won’t do anything more since it’s NNN, which she’s never really done before. She’s also been teasing me a lot today and grabbing me, saying suggestive things but whenever I try to initiate anything, she shuts it down and says it’s part of the discipline.

I’ve tried telling her that I’m starting to feel frustrated and disconnected, and that I don’t think an entire month like this is healthy both mentally and physically, but she insists it’s something she wants to see through.

I love her deeply and don’t want to make this into a fight, but I’m starting to feel uneasy. It’s not really about the lack of sex it’s more about the sudden change in our dynamic and the feeling that she’s testing me or trying to prove something. I’m worried that if this continues I might start to feel resentful or emotionally distant, which I don’t want at all.

Has anyone been in a similar situation or have advice on how to handle this without making it into a bigger issue? I want to be respectful, but I’m honestly struggling to understand why she’s taking this so seriously.

TLDR: My girlfriend is taking NNN too seriously and too quickly and it’s already starting to affect the way I feel about her. I don’t know what to do about it without hurting her feelings.