"[…] It's not like they had decided to ignore me. You know how it feels when someone is ignoring you. You can feel they know you're there. This was like they didn't register me as a person they had ever known." (23.11)
Even if Star is dumb, Frankie can't help but be shaken by her account of what happened when Dean broke up with her. After all if it can happen to one, it can happen to all. Frankie could be in just as precarious a position. And yet, she finds a very different ending than Star does. Why is that?
When I act the way I acted, Matthew doesn't like me as much as he does when I fall off my bicycle. (24.55)
It's a little disturbing to Frankie that Matthew seems to like her best when she's playing the swooning princess, in need of a prince to come slay the dragon for her. Which makes us wonder: why does she bother playing the swooning princess in the first place? Is Matthew really worth it?
Frankie was glad he was gruntled. And she was angry that he wouldn't tell her why. Both. (33.51-52)
Even when Frankie pulls off her first awesome prank, she can't share the moment with Matthew. Well, that's what happens when you and your boyfriend are lying to each other, sweetheart. She's really put herself in a tough position here.
Eventually, she figured, he would suspect someone outside the pack and finally accuse her, angry but admiring her genius, acknowledging her as the superior mind. (34.3)
Frankie's not just trying to totally mess with Alpha. Here we see the real motivations for her betrayal at work. She wants recognition, acknowledgement, props.
"I was, I—this came up, and I promised Alpha. You and I didn't fix anything certain, did we?" (39.24)
So much for her prince charming coming to save her at Thanksgiving. Matthew keeps saying that he cares about her, but Frankie comes to realize that he doesn't want to be a part of her world. That feels like a betrayal to Frankie because it goes against what she thought having a boyfriend would mean. It's, to be quite frank, not all it's cracked up to be.
In Matthew's backpack was a printout of the emails between Frankie and Porter. (39.30)
Ouch, that's gotta sting. Why would Matthew have a printout of her conversations with Porter? There's something very shady going on in this relationship, and the betrayals are going back and forth more than terms of endearment. So why does Frankie stick it out?
Yes, that was the most likely conclusion. Porter had given Matthew a copy of those e-mails. But why? (40.40)
In the double whammy of betrayals, Frankie finds out that her current boyfriend is in cahoots with her ex-boyfriend. This just keeps getting weirder and weirder.
"What were you being loyal to, huh? Or were you jerking people around to make yourself feel powerful?" (43.112)
Matthew won't accept Frankie's rational explanations. He's never been able to accept her thoughts as valid, and he's not going to start now. It's the final nail in the coffin of their relationship, and it's the culmination of Matthew's one big betrayal all along—he's dating her for his own selfish interests—not because he's genuinely into her.
"He's getting expelled! You lied to me!" Matthew grabbed a small metal bowl from the nurse's desk and threw it against the wall. It hit the floor with a clatter. (43.121)
Matthew is none too pleased when he finds out that Frankie is the culprit. Instead of being impressed by her brainpower, he's just disgusted. He won't see her as brilliant, which is what she wanted out of their relationship all along.
Matthew would rather let her keep the shirt than interact with Frankie for another second. He hates her that much. (46.56)
In the end, there's nothing between Frankie and Matthew. It's like they never shared any kind of intimacy. And we're left wondering if they did. After all, if they had really shared something special, you'd think they could maybe work through this. But maybe there's nothing to save here at all.