I'm sorry you didn't sleep well last night. The therapy session will be good for you today. Yes, they all tend to use the script in MLC and in some cases as a WAW too. The only difference can be the actions that they take.
As for her text messages to the OM...it's called an emotional affair. To her, it's just sharing and talking about work, but she should be turning to you for support and certainly not 150 text messages to the OM, even if it is about work. As for the client, do you think that incident was real or did she imagine it? I know that my xh thought his co-worker's wife was flirting w/him and had the hots for him, but that wasn't the case at all. She was just being courteous to him when her h wss in a motorcycle accident and we came by to visit w/them. All she did was smile at him and he was off to the wild blue yonder thinking she wanted him. Maybe this is the same type of fantasy in her mind. Maybe she's talking out loud about it to make it more real and also see what your reaction will be.
Yes, I do understand the frustration of not having any control over the marriage at the moment. Just remember, you do have control over you, what you say and how you react to things. You can choose to sit and do nothing or continue to work on you and keep your focus on you and your kids...which I believe you are doing w/your whole heart.
Good luck w/therapy today. I do hope it helps.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.
