If you start to notice that a person has started to use the same gestures and intonations that you do, it doesn’t mean that he is your new fan or that he is trying to tease you. It is more likely that he likes you and is copying you subconsciously.
Something is going wrong. You need to talk.
You are always trying to say something to your partner, but it happens that it is inconvenient to speak: her body is turned away from you, she doesn’t look into your eyes, and she tries to keep a distance. These are all unconditional signs of problems and antipathy.