I agree, but I also try and look at it from Artie's perspective, he thought they had something in common that made them stand out from the others and they could relate to each other. He thought he would always have her to talk to about their 'disabilities' if things got tough or something.
I guess just knowing that someone else is going through kind of the same thing you're going through makes your problem easier in a way.

I think he might have also been upset that she kind-of lied about it to him, but I don't know how long they've been friends for. Like if they've been close friends since 1st grade or something I would have expected her to tell him sooner... but that was her decision.

But I also think he could have been a little nicer about it, and not made it seem like that was the only reason he liked her. Which I'm sure it's not, but I guess boys aren't always the best at saying what they really mean... idk. haha.

I agree with both of you. It was a "well, crap" moment for me:)