My CBT T has said that some of his patients get offended because they think he is sighing. He said he was just using a breathing exercise when a conversation raises his own anxiety.
Sometimes with me he will look me in the eye as I'm rambling too fast and then he takes a deep breath and exhales then he smiles and says "slow down for a sec and take a deep breath".

He is very expressive and has very warm and open body language unlike so many T's in my past who were stony faced poker players. I like a T who is easy to read.