Alexander remained frozen, he couldn't understand what was going on. He was shocked and surprised by the fact that Serena knew about his affair with Marga.
They had done their best to keep it a secret. He didn't know how to turn the situation around in his favor. Now he understands why she acted the way that she did with him.
His secret was out. He swallowed nervously, sweat trickling down his forehead as he tried to think I'm what to do about that matter.
Serena could hear all the taunts that he said to her before life withered from her eyes. He had killed her and wasn't sorry for it. He was okay with draining the life from her eyes and it broke her heart.
He didn't care. But it was too late now, one day he will learn that she deserved the right not to be treated like a game.