Forum:Nnoitra and Nelliel?

I have a few questions and a few speculations. First off, what exactly is the reason that Nnoitra and Nelliel hate each other so much? It still confuses me. Also I think it's possible that in some strange way they cared for each other, even though they seemed to hate each other so much. For example: Why is Nnoitra so obsessed with beating Nelliel in combat when most other people would have just payed no attention to it and let it go, why did Nnoitra always become embarrassed with the thought of Nelleil beating him, how come the only person that Nnoitra told about his inner self was Nelliel, what was the real reason Nelliel saved him from the Hollow, when Nnoitra died he was looking around the battlefield and made eye contact with Nelliel and she called his name before he died, and finally why did Nelliel stay behind on the battle field after Nnoitra died and everyone else left? I think there's a possibility that there is some sort of relationship between them, an obscure and strange one. I think that the relationship between them is more obvious than the one between Orihime and Ulquiorra, at fist them hated each other and then right before Ulquiorra dies it becomes obvious. This reminds me of some other anime I've seen where there were these two characters, they hated each other and were enemies but by the end of it they had fallen in love. This was just something I've always pondered about and wondered if anyone else has noticed. Now what does everyone else think about this?