You made a good decision. When my heroin addicted brother (I was the enabler) was in his "heroin heyday" I'd driven him to almost every place imaginable, homeless shelter, rehab, etc., and I hated every minute of it. I felt my parents had given up on him, when they kicked him out. Little did I know at the time that they were in fact making the right decision for themselves by detaching themselves from the emotionally abusive aspects of his disease.
I took over the "enabler" role after I found my brother sleeping in a snow-covered wooded area on a night when the temperature outdoors was below 20 degrees. Instead of calling the police, I brought him home with me and allowed him to stay at my place. My decision to do this was based on pure pity and a false idea that I could actually help him. All I pictured in my head was the kid that I grew up with, sharing a bedroom, stories, friends, etc. I was wrong. For me, the idea that I could help was the most difficult thing to move away from. The truth is, only the addict can help himself/herself.
Sadly, in my experience, an addict will not come to this realization when family members & loved ones enable him/her to continue along a destructive path.
It flies in the face of human nature to "abandon" somebody you love. Taking your addict to a shelter isn't abandonment. Try to find some comfort in the fact that others seemed worse off than he. Maybe he'll dig deep and become an inspiration to these people.
Either way, the bottom line is that you have to get along with your life, as much as it hurts to do so. I wish you the very best. You have my sympathy.