This is the story that came to my mind when I first saw this;

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As Wendy sits atop the cliff overlooking the town, she can sense someone else is there with her.

"Hey Wendy." she hears.

Wendy looks back and see's Mabel standing behind her. Unlike normally, a braces-filled smile isn't on the pre-teen's face.

Wendy ignores her, looking back at the view of the town. She was probably there to just talk about Dipper. Her suspicions were right, but what she was told, no one else could believe.

Mabel sits at her side, Wendy scooting away, glaring at the view of the town.

Mabel notices this and sighs.

"I get that you're still mad. And you do have a right to be, but not at my brother, only at Robbie."

Wendy rolled her eyes. Her she goes, just trying to make her brother seem better than the selfish kid he truly was...

"Robbie hypnotized you with that music, and was tricking you into doing something you would know you're not ready for if your mind was in the right place at look-out point."

Wendy thought about this. Robbie had said Nate and his girlfriend would be there, too, but he didn't show up. And Nate didn't even have a girlfriend! She remember Robbie had also taken the back-seats out of his van, leaving enough room for someone to lie down, maybe even two people to do so!

Wendy hid her surprise, staying silent. Mabel could tell that Wendy was realizing this.

"He cares about only himself, but my brother doesn't. He was just trying to save you from something you weren't ready for."

Again, Wendy rolled her eyes.

"And RIGHT after I dumped Robbie, he asked me to go bowling." Wendy finally spoke up.

Mabel nodded.

"That wasn't something really wise, I get it. But he was just trying to be nice..." Mabel replied.

"You can tell me all you want Mabel, but he only cares about himself, just like Robbie."

Mabel shook her head.

"That is a damnable lie!"

Wendy was surprised; Mabel NEVER cursed before!

"Dipper actually had a chance to be with you earlier this summer. At the Mystery Faire."

Wendy remembered that; he had accidentally given her a black eye trying to win her a stuffed animal, and Robbie had chilled it down with his sno-cone and asked her out then. And she had left Dipper alone without even giving him a chance to apologize! Regret instantly shot through Wendy faster than a bullet.

"He missed the first time, but then we ran into a time traveler. We used his time-traveling device again and again for him to try and win u that without u getting that black-eye, and for me to keep winning Waddle's over and over."

Wendy wouldn't have believed this, but after that incident at the abandoned convenience store and Robbie's hypnotizing CD, she knew this shouldn't be unbelievable.

"But the ONE time, after more than a hundred tries," Mabel continued "when Dipper FINALLY won that stuffed animal for you, with my help, I didn't win Waddle's."

"And for me to be happy, he went back and lost on purpose, just so I could win Waddles. Call my brother selfish all you want, girl, but he's not."

And then, without another word, Mabel left.

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