Hikaru's Guilt Options

[Shiidou Hikaru]

When Hikaru first met Lantis, she couldn't even look at him because of the guilt she felt for what had happened to his brother Zagato. She even invites Lantis to physically abuse her, but obviously Lantis is a gentleman and could do no such thing. That scene was a keen demostration of how low Hikaru's self-esteem had become at that point, she had become completely worthless in her own eyes.

[Itena]

I don't actually think that Lantis ever treated the Magic Knights coldly. I think it was more like that's how he is, he's the type to hide his emotions, and that can be misinterpreted as being cold. For me, Lantis isn't really the type to treat anyone coldly, he's just too darned nice for that. In fact, Lantis is extremely kind and gentle(one of the kindest of the bunch); which could be a similarity between him and Hikaru, though I could say that they each express their kindness in different ways. Another thing about him is that he can probably read other people easily, which could explain why he fully forgave Hikaru.

As to when he fell in love with Hikaru, I think it's one of those loves that grows over time, without showing itself till the very end. Although, I had thought about that whole family curse thing too, before. XD You could even take that concept to Lantis' friendship with Eagle Vision, since Eagle could of been the pillar too.