You should really post your question to the FSW section of the forum. This section is for Canadians and PR who are sponsoring their spouses, which is a totally different process.
If your status changes, you MUST inform CIC, regardless of whether they ask you. Failure to disclose a change in status could result in your PR being revoked due to misrepresentation and your spouse being forever barred from being sponsored. If you become common-law (live together for 12 months) or married, you must inform CIC immediately.