It’s very common to end up stuttering less when you tell people you stutter. My assumption is you’re not wasting brain power on worrying what the other person is thinking because you know they now know you stutter. There’s been research done on this. I don’t have the link but it’s mentioned in this excellent episode of The Stuttering Springboard podcast — https://pca.st/episode/a0dd706c-fcd7-454f-8978-62cb9709105c