In addition to all the good things Marle already stated, I'll tell you firsthand it is possible to love an addict to death.
My parents were my best enablers. They 'supported' me in numerous ways over the ten years of my active addictions.
When I went to rehab, I weighed 109 pounds (I'm 6' tall), had blown out all the veins in my arms, was too weak to hold my head up for long, and was pregnant.
I was days away from death.