Heroin Addict

Hello out there-

I was hoping someone could give me some advice.  My boyfriend of 9 years is a severe heroin addict.  As far as I know, he started using about 6 years ago.  He supposively has been on and off the drugs.  He has been completly detoxed with some kind of surgery and has also tried methadone.  I really believed he was no longer using heroin until we went to Jamaica for a week together.  The airline lost his bag and in his bag was his detox pills from the doctor.  He became very ill and admitted to me what was going on.  I am not a drug user and find this very hard to take.  He is currently laid off from his job and lives at my house.  I pay all of the bills and find my situation very frustrating.  I just caught him this morning shooting up in his truck outside of my condo.  I could see inside his truck from my bedroom window and clearly saw what he was doing.  He has withdrawn over $600.00 from his bank account.  I am not sure what I should do.  I do love him but do not want his HIV diseases.  Can anyone out there give me some advice?  Do I kick him out of my house?  He refuses to go check himself in to a treatment center. Someone please help!  Thank you.