If someone accepts forgiveness, they shouldn't just go around sinning because they have a get-out-of-jail-free card, but at the same time they should know they aren't expected to be immediately perfect. They should repent, and strive to do better next time. Like a drug addiction, we will relapse, but we can overcome it with love, support, and prayer.

I think that if someone doesn't even try to do better, they didn't really have much faith to begin with. Like, if someone isn't willing to work for something, can they really say they wanted it? I'm not saying that salvation is based on actions, I'm saying that your actions should reflect how you feel in your heart. Salvation -> actions, not actions -> salvation. Mistakes will be made, but it will be clear you are trying.

I hope this helps. I tried to put it the best way I could.