he did hide his feelings for her, but what does it matter, at least he cares for her and besides, Ты can't have Любовь without caring for someone right?
if i were him i will tell ten-ten that i like her because what if ten-ten also like neji. thwy will like each other. but if not at least neji made the right choice to confess
yes i do cause it looks like he really cares about her.example: in one episode in shippueden when team Gai v.s Kisame Neji,Tenten,and Rocklee got trapped in some water prision and Neji starts to worry about Tenten.Later on (when they get out) Neji catches Tenten from falling and asks her if she is alright.If Ты look at Neji's face at the time when he says it he is tries not to look at Tenten или he's being shy like Hinata when she looks at Naruto. Sorry if I spelled anything wrong