Your opinion is absolutly correct!Can't beat a dead horse.
At what point do you stop trying with someone? Or do you not?
For me, a pivotal point was with my most recent ex. He was non Christian and when I attempted to break up with him, he came back saying he was open to the idea. Well, we ended up breaking up for good down the road. After a few weeks, I truly missed him and felt God put me in his life to bring him to Him. I decided to reach out to him and after some chit chat for a few days he asked if I was going to church. I said yes, that he should come sometime, and that I would gladly escort him. His response: "Haha nah not my style"
I knew right then it was a done deal. I wasn't going to try again. It was like God told me, there was no point because only God can save. WE don't save people. We are merely messengers. IMO.