For a little while now, Robin has been getting roses.
Just every now and then, he'll walk into his room and there it will be, a flawless rose on his desk, with a little card bearing nothing but a stylized copper "S." He hates how unsurprising it is that Slade can break into the Tower undetected.
Robin should set up traps in his room, attempt to use this to his advantage.
He says this to himself every time, and every time, he just picks up the rose and stares at the velvety petals and wishes he could bring himself to crush the bud beneath his boot.
Each time Slade kisses him, a part of Robin dies, like a petal falling from that pink rose, once white, and getting redder and redder every day.
He wishes that Starfire would come to honor his death once in a while instead of Slade. But that's never going to happen; she doesn't even realize he's gone.
So his killer is the only one to mourn him, with roses on his living grave.