Need support navigating the change in my marriage

[G8r]

Each day seems like we are inching closer to divorce. Even though I'm doing my best to avoid conflict, my W seems to think everything is a conflict. Last week she asked me if I could pick up D3 next Monday after work so she could do something as part of her work. I told her yes without looking at my calendar because I don't schedule a lot of things (I tend to play things by ear, do things spontaneously). It turns out I have an IC session next Monday that I scheduled 3 weeks ago and told her about it. So much for my 180 and being better with scheduling. She seemed ok when I told her and reiterated that I get better at letting her know. She followed up with I don't know what you're going to do when I'm not around any more. I didn't know how to respond so I told her I'm working on getting better at it and dropped the topic. My problem was my difficulty hiding the drop in my emotions following her comment because it made the D seem so real. How do I fake happiness in a sitch like that because she easily saw the change in my demeanor. She may have misinterpreted it as anger rather than sadness, but she saw.

A little bit later, she was trying to leave to go to trivia, but D3 didn't want her to go. She wanted her to read a book and chose a long one. I didn't like when my W told her she would start it and I would finish. I told my W to please not make promises to D3 for me. Although I was calm and said please, my comment angered her. I told her to be safe when she left, be safe on her trip today since I won't see her and that I'll see her on Sunday. She said goodnight to D3 as she left and mumbled something I couldn't hear towards me as she left. Uggggg. Things like this were never a problem before she started talking to the om. I wish things in my M were going better. I want to fix them but can't and that is just eating at me.

Anyone with some advice?