What does this mean?

My ex posted this on his facebook tonight. What does it mean: The world in which you seek to undo the mistake you made is different from the world where the mistakes were made. You are now at a crossing. But there is no choosing. There is only acceptance. The choosing was done a long time ago.

Does it sound like he regrets dumping me? And wants me back? If he does what should I say if he tells me he does and etc?
What does this mean?
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