What does it mean when an ex girlfriend acts hot and cold?

More details are in my other questions...

To sum it up my ex girlfriend invited me in when I walked over a Christmas card to her house last week. We had a nice talk about stuff going on in our lives and I felt that old spark again. Since this was the first time since the breakup that we had a lengthy one on one time in person, I figured it couldn't hurt to ask her to hang out, as friends.

I asked her to hang out a few days ago and she said, "sorry but I really want to make this junior worlds archery team and all my free time goes to training". I figured she was telling the truth because she really is dedicated to her activities..in fact her dedication was one of the conflicts in our old relationship.

i told her it was no problem and I totally understand if she wants to do what she loves doing.

just earlier today I chatted her and asked her if I could borrow a video game that we used to play a lot. she said that she didn't have it. I felt that something was up because we just talked about the game a few days earlier. I asked her if she sold it, and she said "nope, but I don't have it anymore, sorry", and then logged off immediately,

im sure if I asked her about it she would say that she was in a hurry to go somewhere, but I know her well enough to sense that she didn't really want to talk to me. that's strange...i recall a week ago that she invited me in her house to talk.

any advice on what an ex girlfriend who acts hot and cold is thinking?

oh and I don't want responses saying, "move on she's not worth it". while that may be what you think is best, my question is what she is thinking, not what I should do.

thanks to everyone who responds!
Updates
+1 y
oh yeah and on Christmas she chatted me saying thank you for the card and merry Christmas to me and my family.
Updates
+1 y
i wouldn't consider us as "friends"...the Christmas card was the first time we've talked in 6 and a half weeks. the last time we talked she was ranting about how she couldn't get over what I did and how she didn't feel comfortable being friends with me
What does it mean when an ex girlfriend acts hot and cold?
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