Looking through my text history, I notice that I'll have hung out with a girl and later on text them something like "So good hanging out with you today." I almost never get a response and it seems to completely kill the interaction. What do you think might be a better way to keep things going?

I'm trying to figure out why I do it and then, further, why it might contribute to being try hard or needy. Why? It feels polite to follow up. It feels like the right thing to do. It feels like a good way to continue the excitement of our connection. But, of course, it doesn't stimulate much more than dead air. How do you think the girl reads it? Should I simply let communication fizzle, let them wonder, hit them up a week later? I gotta figure out a way to break this habit.