Let's face it, Arnold secretly knew about Helga.

The Valentine episode, I thought Arnold would have figured out that was really her. Especially when she almost went off at him and then she went to her girly voice.

The main giveaway is the second episode in the first season, 'The Little Pink Book. The last poem is spelling out the letters in her name but she stops Arnold before he finishes.

H is the head I like to punch
E is for everytime I see the little runt
L is for ..........



'The Little Pink Book'
https://www.youtube.com/watch?v=oGdlCcbA3yY

´¨¨)) -:¦:-
¸.·´ .·´¨¨))
((¸¸.·´ ..·´ Jewel-:¦:-
-:¦:- ((¸¸.·´*

Yeah that whole "whatever you say Helga" was big giveaway....he said that whenever she was being nice to him and trying to cover it up. He knew she liked him deep down, but I don't think he knew to the extent...I mean she had a shrine of him lol.

You're missing the biggest clue of all. The episode in which Arnold visits Arnie has Arnold dreaming of a flip-flop world in which Helga (Hilda) is sweet, romantic, and into poetry and looks just like Helga in his world and he's attracted to her. He's attracted to the way Helga is when she is not a bully. Also, Hilda (Helga) is into Arnie (Arnold) which is the same way it is in Arnold's world. His subconscious knows Helga is in love with him, and it also shows that Arnold quite likes Helga too when she's nice. That has been alluded to in multiple episodes ("It Girl" and "Helga's Masquerade") I think Arnold is in denial because he can't reconcile Helga's bullying him with her also loving him. But hey, give him a break, he's only nine after all.

-Romeo and Juliet= kissing him a long time.

- saying "whatever you say Helga." Sarcastically to indicate she's lying.