UNOWN

He knew why he was so angry at her. Yes she had betrayed him. Yes she had run away from him, but that only scratched the surface of his pain. Vegeta had learned a valuable lesson on Namek. He had learned to love another, but unfortunately he had skipped an important part of the teaching. He never learned to love himself.

That was why he was so angry. He knew that he was worthless. He was nothing more than a monster, whose only use was to rampage across the universe, causing destruction and bloodshed in his wake. For all his power, for all his strength, he was a creature to be scorned and hated. To be spat on as he passed. His arrogance shielded him from the truth. He was a bastard, unworthy of anyone's love and her leaving proved it.
[...]
His anger was directed at himself. He had dared to be disappointed when she had turned her back on him. He had dared to hope. He had known better, but he had ignored his common sense and his instincts.
[...]
“Well, I surely don’t want to be here if Lord Vegeta finds out that I sent his female off to play court whore for his enemy.”

Bulma smiled sardonically at her words. “What makes you think he holds me in such great esteem?”

Saffron met Bulma’s eyes and replied with equal intensity, making sure that the woman heard every syllable.

“What makes you think that he doesn’t?”

Bulma looked away, and Saffron could see more pain heap itself on the already struggling woman. She sighed again, wishing that she was anywhere but here, having this particular conversation with the Empress of the Universe.
[...]
The rafters shook with the force of his primal scream, the pillars cracking under the strain. He could feel the power growing inside, twisting like snakes, snapping and hissing with poison. It felt different than it had the first time he had turned Super Saiyan---like something was missing, something vital. There was no love; only hate that lived inside of him like a malignant cancer. Hate for everyone and everything. Hate for her, for his men---and most especially, hate for himself.
[...]