[She'd been forcibly summoning up some cheeriness to try to change the mood, but now that effort all fades. She glances over at him , withdrawn, unsure how to feel.]

It's your secret to tell, Karkat. I won't say anything. ... And if you want to be friends with him-- [She meets his eyes.] I won't make it awkward, either. Okay?

[Willow still doesn't know how she feels about this, knows she isn't selfless enough to feel completely unthreatened here, but she wants to be. She has to start somewhere.]