She believes that Tobias belongs to her now. She doesn't know the truth, that he belongs to himself.

Come on,'he says.' I have something else to show you.

Okay, okay.” I set my hand on top of his and guide it to my chest, so it’s right over my heart. “Feel my heartbeat. Can you feel it?”

“Yes.”

“Feel how steady it is?”

“It’s fast.”

“Yes, well, that has nothing to do with the box.” I wince as soon as I’m done
speaking. I just admitted to something. Hopefully he doesn’t realize that.

I am a child. I am two feet tall, and asking if she loves me.

Why is your heart racing Tris?

Can you tell me where to find Tobias'? I ask. When I imagine his face, affection for him bubbles up inside of me and all I want to do is kiss him. 'Four, I mean. He's so handsome, isn't he? I don't really understand why he likes me so much. I'm not very nice, am I?'
-Tris