I would tell future hubby that you and your yarn are a package deal. If he wants you then he has to love your yarn too. Knitting is just like a child. It demads attention and cant be seperated from its mommy!
Besides - knitting is more of a disease than an addiction. (no quibbling that addictions are diseases) There is no cure, and only one treatment.
While your disease is not covered by health insurance. There are no doctor bills either. Just the cost of the treatment its self.
You could have a real heroin addiction, or gambling, or have a fetish for sports cars, fur coats or electronics. So really your treatment costs are small and insignifgant compared to what they could be. And FAR cheaper than a therapist.