Well, he either is or isn't your abf, appears that since you made no firm breakup with him, your relationship is still on the green light. That being said, make sure that you are firmly strapped
in your seat as the roller coaster ride will continue.
I thought I had read that one of your ex's was an addict too, have you questioned why you keep getting involved in these unhealthy relationships? If it were me, I'd concentrate on getting myself healthy, go to meetings, engage in therapy, do whatever it takes to learn how to secure a more managable, rewarding, peaceful life.
I would disengage from him, if he finds recovery, stays clean for at least a year, while continuing his recovery program you might consider reuniting wiith him on some basis.
This is your life, there are no dress rehersals, do what is in your best interest.