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How long did you live together before you separated after you married?
If he married her after marrying you then in the eyes of the law in Canada that second marriage is not valid.
You have no means of suing him in Canada.
In Canada you cannot sue for moral damages. And you cannot sue because a marriage ends no matter what the reason.
Had he supported you for some time you could sue for support.
If your marriage lasted more than 5 years or so you could sue to share in the value of any assets acquired during the marriage.
But unfortunately based on our laws there is no grounds for suing him.
You can report him to the police if you like as bigamy is a crime in Canada.
I am sorry this happened to you and sorry this is not the answer you were hoping for but you've been hurt enough and you need the right answer so you are not harmed further.