Divorced but wanting her back

[Nugget]

I, my W and our S have been spending some time together. Thursday she called to talk to our S after work as she does every day and asked if she could come see him, because she was missing him. I told her we had plans to go to the movie together (he had his kindergarten shots, so I told him I would take him) but, if she would like she is invited to go. She said she would love to, but was hungry and wanted to know if we wanted to meet to go to eat first. We agreed and did so. We had a great evening out, the three of us. Very playful and interactive. We followed her to her house, she had some business mail of mine and when we got there she was very cold to both me and our son. Kind of a 180 from 15 minutes before.

I had mentioned to her during our outing, that I really wanted to go to see the new "Bourne" movie at the drive-in movie (something we used to do almost weekly before) over the weekend and that I did not want to go alone with our S and asked if she would be interested. She said that that would be fun, let's do it tomorrow on Friday. After the cold send off we received on Thursday, I kind of just figured our outing for Friday would not happen. To my surprise, when she called on Friday to talk to S, she asked me where we should go eat before the movie. We once again had a great afternoon and evening together, about 5 hours worth. We'll when I dropped them off at her house (son was staying over for her weekend visitation) she once again became very cold to me. She had even locked herself out of her house and I got a window open for her so she could get in. To which I did not even receive a thank you. I told her I had a really fun evening and thanked her for going to the movie with me and spending time with me. To which she replied half heartedly, yeah I had fun also. Then she closed the door in my face.

I understand the roller coaster syndrome, but why the instant cold should when our time together is coming to an end? I know she is not happy with her living conditions. Could it be because she hates to go home to it? Or could she maybe be enjoying our time together and gets sad when it comes to an end. Or does the end of our time together make her think that it would be nice if we were going home together, but I will not go back to living with that man. He caused me too much pain and I will not go back to living with him.