If you have officially landed with your COPR document to become PR, then no, you can't have your PR revoked on the basis of the breakdown of your relationship - especially due to the length of the relationship prior to applying for PR.
In the scenario where you haven't landed officially, then I'm unsure but it sounds like you've already done the landing process.
Now, as long as you maintain your Residency Obligation (reside in Canada at least 730 days out of 5 years) and the other rules surrounding PR status, then you have nothing to worry about.