If your boyfriend is eligible, he can apply for Express Entry to immigrate to Canada as a skilled worker. He can then bring you with him if you are married when he is able to immigrate. If not, he will have to sponsor you after he gets his permanent residence and you are married.
You will not be able to immigrate through Express Entry if you are on disability. Your only hope would be to sell your house and open a business in Canada; however the threshold for investor immigration is extremely high in most provinces.