Love does not delight in evil but rejoices with the truth. 7 It always protects, always trusts, always hopes, always perseveres. (I Corinthians 13:6-7 NIV)
If you truly love someone you will not give up on them. You will do your best to protect them from danger, and especially to protect them from temptation. You can always trust God and hope for Him to save the one you love even when the one you love has betrayed you and become untrustworthy. If you truly love someone you never give up on them. You never stop praying for them to repent, or looking for evidence of genuine change. You persevere in helping them, in hoping for them, and in praying for them, even when other people tell you to stop.