My story - help please

[theUF]

Thanks again CB.
You make good points and I've re-read your post a couple of times already.

A new step was made today
We went to the meeting, signed the documents about leaving each other, and came to an agreement about S.

The meeting went down without to much hassle. We agreed on most things, and came to a understanding on the rest.
In a couple of months we will have another meeting to discuss if the agreement has worked or not.
I got to say what I found important and so did she.

When the meeting was over we went outside. She stopped, I continued walking, but turned around and told her goodbye, see you. The conv went something like

Me: Goodbye, see you.
Her: Oh, ok.
Me: ? Was there something else?
Her: Is there nothing you want to talk about?
Me: I thought that's what we did back there?
Her: Yeah. Ok. Can you drive me to my car? It's 5 min away
Me: Sure.
Couple min passes.
Her: Are you satisfied with the meeting and such?
Me: In this context satisfied is a strong word, but I thought it went down quite ok considering.

She suddenly started getting agitated and said I should stop feeling sorry for her and stop trying to be her "shrink". I told her, I'm definitly not, don't mean for it to come across that way.

She still was agitated and I told her to calm down.
She didn't.
I told her if she couldn't get a grip, conv is over and we will talk another time.

Her: You're acting weird! You say you have plans all the time! And you talk about how we should handle new partners somewhere down the road.
Me: Yeah, I do. I'm letting you know I have plans. That's what I should do. And we should talk about these matters, to avoid any bitterness or fighting.
Her: But you don't tell me any details about the plans!
Me: When I have S you mean?
Her: No whenever.
Me: You left me, you don't want me in your life. Why would I feel obligated to tell you all the details? I let you know if it is important though.
Her: It's like you have another woman! Is that the case?
Me: Why do you ask that? But no, it's not the case. Things are a mess now, I'm chosing to focus on me and S now. What about you? Do you have a new partner?
Her: No I don't.

After I told her I wasn't involved with anyone, all the anger went away. She did a complete 180. Friendly talk, joking, smiling. Almost borderline small "joke-flirting" if that makes sense.

Did not see that coming. Seems like this may have been the root to her erratic behaviour lately.

I said good bye and we went our ways.