Again, perfectly lovely. Luna would absolutely visit the grave every year with flowers and respect.

He doesn't want her to think that; he would prefer it if her thoughts were kept to nargles, wrackspurts, and snorkacks. If he keeps a close eye, no harm can come to her while she chases her imaginary friends across the world.

Oh, yes, this. He would think this.

We have a memorial for them, Harry. You don't need to carry their names around your neck to make sure you never forget.

Oh, poor, Harry. I love that Luna is so able to see through his facade and know exactly what is bothering him.