[She's quiet for a few moments, and it seems like she's dropped the conversation there. It's not until he's probably lit his cigarette that she speaks up again, sounding dismissive.]

...It's not childish. [But she doesn't sound mad, at least. Even though she just denied it, she knows that it totally is...] I guess if I were to explain it to you, it's just that I never really got to be around people like this before. When I hold hands with someone that I don't really like because it's what I'm supposed to do, that's a cold feeling. I've chosen you myself, so it's nice.