Addiction

I really need some help! I am NOT the addict! Just found out that my fiancé has been doing heroine :( not only has he been doing it but he has started stealing money, selling MY personal items that I worked very hard for. A laptop, some seasons of shows I watch, tv, his phone, a necklace which was a gift from me. Also he has gone down stairs and stole from my landlord. I knew something was going on but I never had proof. Also felt it was drug related. Finally after months of our relationship having some serious strain I got informed. Really thought I was going to be mad or start screaming. I didn't... I saw the man I'm in love with in a different light. Someone who needed help. Someone who was scared. Someone who was battling a disease alone. He has gone today or at least I believe he has gone to a local rehab. I am taking off work tomorrow to make calls for grants and find local meetings. My question is how many of you have dealt with addiction with a loved one. Any advice?? What should I expect? I have already started leaving money at work in a locked locker. Seriously nothing of value is left in my house.