Killua is extremely obsessive and possessive

Leorio and kurapika are always concerned for you.

Killua: Lama! I told you, you can’t go anywhere without us!

Gon: so what? They’re just talking and he was 12 like us?

Kurapika: Gon is so innocent and clueless.. killua it’s okay she probably just wanted fresh air

Leorio: yes and besides she was probably just helping that boy..

Killua: no how dare he even try to talk to her?! killua pulls you down on his lap and starts moving