If you are living with this boyfriend for 12 months or more and can prove it, he can sponsor you for PR, see
http://www.canadavisa.com/canada-immigration-discussion-board/spousal-sponsorship-t46995.0.html and
http://www.cic.gc.ca/english/immigrate/sponsor/spouse.aspThere is no other spouse visa for spouses of Canadians other than him sponsoring you for PR.
If your employer wants to keep you, you can also try for an LMO and a regular work permit. If you have a skilled job, your employer could sponsor you for PR under PNP. If you have been working a skilled job for 2 years, you may qualify to apply under CEC.