In a subtle way, Jesus was already telling the disciples what will happen to Him: His passion and death on the cross. He choose to tell it to them in veiled language so that they will not argue with Him. Otherwise if He told them directly what He will go through. They will naturally protest and say: “We will not allow it to happen to you.” Simply because of the many miracles that He does for them.
Sometimes, our love for Jesus is anchored based on His miracles and not on His Divinity.