Why Ulquiorra turned into a saddist?

Before

After

Ulquiorra Schiffer is the cuarta (4th) Espada in Aizen's army of Arrancar, and is one of the series' main antagonists. The question is, why he turned into a saddist?

Well, he was in love with Orihime, Kurosaki Ichigo's friend.

They were about to get married when Kurosaki Ichigo appeared.

So Orihime fell in love with Kurosaki Ichigo and ditched Ulquiorra.

Ulquiorra 'emo' ever since. Revenge was all around his head.

He became the 4th espada. (4th stongest among all Espadas)

Ichigo and Orihime weren't happy with that news.

One day, Ulquiorra kidnapped Orihime and brought her to Hueco Mundo (hell).

Ichigo went to rescue her.

For more info, read Bleach Manga 349

http://www.onemanga.com/Bleach/349/01/

-random post-

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Credits to Ashwin and Piravin for the 5 Cendekia pictures!