If you are planning to sponsor your partner/boyfriend under the family sponsorship route and don't or can't get married, you can sponsor him as your common-law partner if you can live with him for a minimal period of 1 year, consecutively. Otherwise, you need to get married, so you will have to wait until your divorce is finalized. There are other routes he can apply to come to Canada. Economic streams such as EE or PNP are some options, if he qualifies. If he chooses these routes, he will be trying to come independently of you.