I still don't own Star Wars. Any mistakes are still mine
His dreams were of Mustafar, he was an observer of his own actions. Choking her, killing her, even as their child slept inside her. He noticed things that he hadn't want to see at the time. The way her eyes begged him to let her go, to spare her, to spare their child.
"NO!" He roared at his former self.
He charged forward, but when he would have grabbed his former self he fell straight though him.
"You can't change the past."
He whirled, facing her. She was wearing a soft white gown, her long dark hair flowing freely down her back.
"Why are you doing this to me?" He demanded, even if the demand sounded more like pleading.
She shook her head. "I'm not doing this." Sad eyes turned back to the scene behind him. "I loved you so much." A sad, mocking smile turned her lips up. "If you had let me go I would have forgiven you for doing that to me."
"You shouldn't forgive me." He tells her, he hears a soft thud and knows Padmé's body has hit the ground.
"You will not take her from me!"
"You have done that yourself."
Her lips curve up in a smile. "That was always your problem, you don't know how to forgive." She cocked her head to the side, watching him.
"Will you ever forgive yourself for this?"
Hearing the lighsaber battle behind him, the shame that filled him that he was too focused on punishing Obi Wan to even make certain the woman he loved more than anything was alright; he knew the answer.
"Never."
She nods sadly. "Perhaps when you can you can be the man you were meant to be."
When Vader wakes he orders a full scale attack on a planet that opposed the Empire. He didn't leave a man woman or child alive. He would make everyone pay for his crimes.