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What province are you in please?
In Alberta common law spouses do not have property rights so that means unless he contributes to the value of your properties he will not be able to successfully make a claim for an interest in them.
However, in any event, it is by far better to have a cohabitation agreement so you are very prudent.
The only way that you can be sure that the cohabitation agreement will be binding is for you to have your lawyer draft the agreement and have your boyfriend take the agreement to his own lawyer for independent legal advice. If he doesn't get independent legal advice he can later say that he did not understand the law or what he was signing.