Neptune is just vain.

Also, Jaune *DID* finally back-off when he thought Weiss was happier without him, [url=http://tvtropes.org/pmwiki/pmwiki.php/Main/TranquilFury]he just went into silent-berserker-mode[/url] when he found-out she was not in fact happy (and confronted Neptune for it). For a person who just recently discovered his spine about 9 chapters ago, this says ALOT about how much he cares about Weiss's well-being.
-I predict he will make efforts to avoid antagonizing Weiss in future chapters.

Afterwards, he wasn't after Weiss at all (that or I missed it because I'm still trying to block Jaune in a dress).

In short, [url=http://tvtropes.org/pmwiki/pmwiki.php/Main/LetsGetDangerous]Jaune is slowly pulling his head out from under his own ass[/url].