have a heart of stone铁石心肠；铁石心肠的，形容人冷漠、记仇。

【例句】
She'll never understand your position. She has a heart of stone.
她永远不会明白你的处境。她是个铁石心肠的人。

If this happens, I might think that you have a heart of stone.
如果那样的话，我会觉得你是个铁石心肠的人。