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The way this works is that you each have the right to share in the pension credits you each acquired over the course of your marriage.
So you can request that CPP do a credit split.
Then you would get half of your former's spouses credits that he earned during the time you were married and he could do the same for yours.
It would affect his pension to some extent because if you were to get more then he would get less.
But you can ask CPP what you would get with and without the credit split and how much he would lose because of it.
Let me know if you need any further clarification.