If it wouldn't have affected anything for either of you, a letter of explanation explaining (1) how you thought it was two years, and (2) that there were no points differences, and (3) you wish to correct the record now is probably a good idea. Lying about address history is not.Yes you are right including me in her application doesn't make any difference to her points. But I am just worried if there is any issue in future if we dont declare since we are living together in a relationship.
My partner was already in Canada on a work visa when I was applying so it wouldnt have affected my points if I added her at that time as well since I wont be sponsoring her.
Just confused what to do at this point.
I imagine that as you are now declaring a common law relationship, the visa officer would want to know when it started if they review address history. Which the may well do.
Please do remember that I'm just a random person on the internet; your question may be better addressed to a lawyer.