It's kinda a thing. But assuming to have a 'thing' means assuming a level of friendship she's not certain they've reached. He's so busy, she doesn't see him much, and as much as he's nice to her he's nice to everybody.

No complaints. Just trying to be realistic about things.

His happiness at the news makes her blush more, but she's also grinning. "Thank you. It's been a month and I'm still kinda in shock."