Partner sharing delusions with other people

I’m unsure of what to do here. My partner has begun to share their delusions with people they meet. They became a regular at a nearby restaurant and made friends with someone there. I thought that was great! And then I find out they are sharing their delusions with this person. For context my partners claims to see spirits, which they call starlights. So, it’s sort of not out of the realm of possibility for other random people to believe if they already believe in ghosts and such. So this person responded positively and wanted to learn more about what my partners claims to know.

My immediate reaction, internally, was to stop my partner from continuing. But I’ve been really trying to dedicate myself to the leap method. I’ve made a lot of progress in understanding my partner. But this really threw me for a loop. So, now I’m hoping this new friend recognizes what my partner says is weird and politely puts up a boundary. But what if they believe everything? Is this how cults start? lol! I feel like I could go down a rabbit hole with this.

What would you do?