I prefer to think of it this way... Your long lost love has a serious problem but he is in treatment this Valentines Day. *With treatment hopefully will come recovery and therefore a chance for a Happy Future (and many Valentines Days) spent together. *
"Addiction treatment must help the individual stop using drugs, maintain a drug-free lifestyle, and achieve productive functioning in the family, at work, and in society. Because addiction is typically a chronic disease, people cannot simply stop using drugs for a few days and be cured. Most patients require long-term or repeated episodes of care to achieve the ultimate goal of sustained abstinence and recovery of their lives."
--National Institute Drug Abuse
Take some time to let the shock wear off,*
Then, learn about his addiction, and the process of recovery, and how this disease will affect you - if you decide to stay.
Best to both of you
Kelley