why is that ariel act and think like a freaking 7 years old?

She feels like she didn't mature and remained innocent like a child. And that after being the one responsible for all the hotties deaths..

Right!! With that she committed grave sin

She was like "Otoke, all this handsome guys died, and it was my fault.. well, couldn't help it, I'm innocent, tehee!"
Thankfully, they are all head over heels for our beautiful fangirl.. (๑•ㅂ•)و✧