I had this also. My T (female) and a female were talking loud and laughing. I felt jealous and sad. I'm not like that. I don't do chitchat with my T. I find it hard to be just casual with a T and to joke around sometimes. I wish I could. It would also be good for me.

How to deal with this? I'm not sure. It started when I saw her interact with the client before me. She was a few times late for me because the client before me stayed longer. Eventually I told her about this. It was bothering me so much.
But it didn't really helped. That laughing, that happened about a week before she went on leave. I've been doubting what she thinks of me for such a long time.
She said that all her clients are different, that's what makes her job interesting. All clients are equally important. That I talk less than most people isn't a bad thing.

But for me nothing has changed. I still feel jealousy.