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My common-law partner is Canadian resident, we have been together for almost 8 years.
I used to visit her often.
Then I got separated from my ex-wife.
When our common-law relationship started my partner was back home back then.
Then we decided to settle down in Canada, so we moved to Canada, according to her wish.
I already had the visitor visa.
On the airport, I was not asked any further question about my marital status, so I had nothing to declare, like all my previous entries to Canada.
No one ever mentioned that I had to declare my relationship.
We had read all the rules and requirements, there is no such declaration.
Will this affect my application?

Thank you

You already had a TRV so that wouldn't be an issue for you. Still unclear when you 1st lived together for 1 year. I assume your common law is a PR. After you lived together for a year and became common law she had to declare you to CRA and on her taxes. She would be in a common law relationship. If she renewed her PR card after you became common law she would have had to declare herself as being in a common law relationship. Basically in any document you both needed to devalue yourselves as common law and not single after you lived together for 1 year.
 
You already had a TRV so that wouldn't be an issue for you. Still unclear when you 1st lived together for 1 year. I assume your common law is a PR. After you lived together for a year and became common law she had to declare you to CRA and on her taxes. She would be in a common law relationship. If she renewed her PR card after you became common law she would have had to declare herself as being in a common law relationship. Basically in any document you both needed to devalue yourselves as common law and not single after you lived together for 1 year.

We weren't loving here.
My common law was with me back home.
We moved recently to Canada together.
Where does she have to declare our relation and how?
 
We weren't loving here.
My common law was with me back home.
We moved recently to Canada together.
Where does she have to declare our relation and how?

This is very confusing. Is your girlfriend a Canadian PR or citizen?
When did she get PR or citizenship?
When did you 1st live together for a year?
Did she ever return to Canada or have you been living together in your home country for 8 years?