True redemption requires repentance and change from the other side. You can love a person drowning in addiction without allowing them to drown you too. Redeeming love sets boundaries that lead to healing, not walls that lead to isolation.
However, in the realm of psychology and healthy relationship dynamics, Amor Redentor requires nuance.
To see Amor Redentor in action, one need look no further than the prophet Hosea. God commanded Hosea to marry Gomer, a woman who would repeatedly fall into adultery and slavery. Each time Gomer sold herself to other lovers or ended up on the auction block of human traffickers, God told Hosea to go find her, pay the price, and bring her home.