I know what you mean about Xander Doug, but in Season 1 and the first part of Season 2, it was pretty much normal high school boy stuff. Leaving the specifics somewhat eliptical to avoid needing spoiler tags: Not being able to see his childhood friend as a "girl", maintaining a low-simmer crush on the hot new girl -- those things were pretty normal. Even having some jealousy toward Buffy's "boyfriend" made sense. But by the end of Season 2 Xander is doing things that he KNOWS are incredibly hurtful to Buffy. At the same time, he's in this bizarre relationship of his own with what amounts to the anti-Buffy. And he seems to have become downright mean to Willow at times. I keep waiting for someone to just slap him upside the head and point out, in great detail, what an ass he's become.