Virtuous people should never change "from virtue to commit iniquity," or they will die (Ez 18:26). After we tell our heavenly Father that we will work in His vineyard (see Mt 21:28ff), we should never change our minds. Jesus said: "Whoever puts his hand to the plow but keeps looking back is unfit for the reign of God" (Lk 9:62). After we tell the Lord, our spouses, our children, our families, our brothers and sisters in Christ, and even our enemies that we love them, we should never change.
To never change our faith and love, we must make some other changes. If we don't change and repent of sins, these sins will change us for the worse. If we don't change and be reconciled with those that we haven't forgiven, then the poison of unforgiveness will change, warp, and destroy our love for God, our spouses, our families, etc. If we don't let God change some habits in our lives, we will become enslaved and forced to change what should never be changed.
Our faith and love in Christ will never change, if only we let God make some major changes in our lives. Change to become unchanging.