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There are no grounds for your claiming any interest in the home as back then common law spouses did not have property rights and even if there was you would be too late as the limitation period would have already expired.
You also did not make any contributions to the value of the property based on your post. Your contributions would have had to been greater than fair market value rent.
I am sorry this is not the answer you were hoping for.
I know that is what you want to claim by while there is no doubt that you were common law spouses you did not have property rights back then. The new law doesn't apply to you as you separated well before it came into effect.
As well, even if you contributed to the mortgage you would have had to pay more than fair market value rent.
And finally, it is too late to make any claim because of the limitation period.