I’m (40M) not in a long term relationship now but I’ve been thinking about this too. I’ve noticed with some people, who are perfectly nice and patient, that even after hanging out 5-6 times I never really get comfortable and stutter like crazy. They’re all different but the common thing about them, which took me too long to realize, is that I’m not actually that into them. I like the idea in my head of what we could have eventually, but the right now is not so good. This is obviously a dumb idea 🙃. Then there are other people that I have zero expectations for, and things just flow and I never stutter. It’s just fun but I have no idea where it will go. I’m trying to follow those interactions more right now. It’s hard. Just have to try stuff and try to learn from it. Good luck!!