My girlfriend broke up with me during the trip I was going to propose, was very cold to me before but now is being normal now that we are broken up?

So she broke up with me on the flight over, she knew I was planning on proposing a week before the trip but said that we should wait. I asked her to give me a chance and wait till we were back, since it wasn’t exactly the best environment to be trying to work things out.

She agreed but was acting incredibly cold. No touching, no smiling, no joking, nothing. A few days in we had another talk and she just said it’s obviously not working out. And I said it’s because she has been putting in 0 effort. She keeps pushing me away. I am trying to act normal and trying to improve things but she won’t let me. I finally agreed to just give up on it and break up.

And since then she has been very snuggly, affectionate, telling me she loves me. Telling me how handsome I am. This is exactly the sort of effort I wanted before, I would have felt more normal with her. But now I am incredibly depressed, confused and frustrated that she couldn’t have done this when we were trying. Only now that it’s “over” does she put in any amount of effort. I am just so confused. 2 weeks ago, I was completely ready to spend the rest of my life with her, and when I begged her to just give me a chance she wouldn’t even try until after it was over.
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4 mo
If she had been acting like this, we could have fixed things. I asked her why she wasn’t and she said it’s because she didn’t want to lie, that she wasn’t feeling those things and wanted to be honest with me. But how can she feel those things now that it’s over?
My girlfriend broke up with me during the trip I was going to propose, was very cold to me before but now is being normal now that we are broken up?
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