Student Loans going after common law partners

First of all I assume it would be neccesary to know that I am in Canada, as I beleive that the law may be different in the US.

I don't personally have any student loans, and am currently making $55000/year. My boyfriend, however, has $50000 in loans, and makes about $40000/year. We have lived together for almost a year, but have never filed joint income taxes, maintained completely separate finances, don't have a signed lease together, all the bills are in my name, and have never expressed any intent to get married. The payment estimator with just his info gives around $370/month (meaning he would be eligible for payment assistance as a single person), and with mine as a common law partner gives $789/month (meaning hes not eligible for payment assistance, and I would be held responsible for what he cannot pay).

I didn't originally think that we would be considered common law in the eyes of student loans, but I called them to be sure. It seems once we have lived together for a year then we are common law. Can I really be held responsible for his loan?