I agree with the comment about having SIN number checked or something to find out your address.
This is a government thing, and to uphold the integrity of the immigration system of Canada, I think CIC or CBSA will definitely be able to find out your address no matter what.
"As a result of the introduction of conditional permanent residence, additional investigations may be undertaken in cases where there is reason to believe that the condition is not being met or has not been met. CIC plans to perform random assessments of the overall level of compliance on an ongoing basis."
Well to answer to the original question:
"If they do not remain in the relationship, the sponsored spouse’s status could be revoked."
"If the relationship breaks down, the sponsor remains financially responsible until the end of the three-year undertaking period, irrespective of the cause of the breakdown."
Source: cic.gc.ca/englisH/department/media/backgrounders/2012/2012-10-26a.asp
What the hell happened though? Maybe go see a marriage counselor or something?