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If this is a document that promises to buy a house for you and you paid him the money why would you want that document canceled?
Did you lend him the money? I am not following. Because if that IOU says he owes you the money why do you want it canceled? Is it because you want the money now?
I don't understand this. It doesn't make sense that he hadn't an IOU to the tax office. That is not how things work.
Did you give him the 250000 Euros and if so did you borrow it from the bank?
You will not be able to get out of the loan with your bank. But, you can sue your former boyfriend for this money. This is a significant amount of money and you should retain an experienced lawyer to sue him so that you can either get the money back or at least seize the house in Montreal.