Phin: hugs, I feel your pain.
yes, it can be love. Not every dam*n feeling is codependency. It's ok to love someone and it's ok to miss them
I left my ex, but that doesn't mean he's not worthy of my love and because I miss the great times we had, it doesn't mean it's codependecy, It means I'm human and have human feelings and miss the good side of the person.
If your ex not willing to get into a program, I'm afraid the relationship would only be much of the same. If she is willing to get help, then you can see.
Not all addicts are useless scabs that are never worthy of love in case they relapse. That's like saying codies are not worthy of love or relationships in case we relapse.
He*ll, some person without addictions can relapse and turn out to be some nut as well
Take care of you for now