carolbb23 said:She said that he overstayed in canada plus worked in canada for a few years illegally so basically he is blacklisted on cbsa data base
Not necessarily. It wasn't until recently that CBSA even had exit data for foreign nationals leaving Canada, as part of the Beyond the Border Program. They also are probably not even aware that he was working illegally, but the OP's possible future husband still needs to be truthful about both, if she decides to sponsor him someday.