This is just another thing I have been doing recently that ties into confidence.
When I get a text from a girl or in the midst of a conversation I will call them by a name that only a gf/bf type relationship would allow use of.
Her: Hey what up?
Me: Hey babe, I'm painting a tree (or whatever else you may do), what about you?
Her: The sky is green (or any other comment you know is wrong)
Me: Well sweetheart, the sky is actually blue.
Does anyone else do this? I've found it super nice because if your confidence is high when you say it then there is no awkwardness and it can make her feel more comfortable.
Anyway if you don't do this try it next time you get the chance, I promise you will have good results.