It was mostly about the Hulk. He was so tired and no cure was coming, and he couldn't keep doing it. Then he was forced to keep doing it. He hasn't thought about that dark period since being with the Avengers. There's no risk of him making that decision here, but there's plenty of risk in how dangerous it is for the soft and vulnerable doctor without a safety net. It has occurred to him, since he's already seen one Natasha leave, but clearly it hasn't stopped him from putting himself out there with her again. To him this is his only chance. He'll have to go back to the Hulk and all the things in their way there. It also is very real that he can only fully function as a romantic partner here. Not that he plans to bring that part up, it goes without saying.

"He's not here to save me anymore," Bruce confirms. He reaches out with his free hand to brush her hair back and cup her cheek tenderly. It's a small touch but a significant one for them. His thumb gently caresses her cheekbone. She is just so beautiful, and she cares about him. She was worried for him. "I couldn't go anywhere without a proper dance, could I?" He smiles at her with more warmth, dropping that hand so he doesn't overstay his welcome in her personal space. "It would be nice if just once I'm around you not looking ridiculous or like a wreck." He knows she's seen him after the Hulk enough times and so this is such a little thing, but it still bothers him. He needs to be at his best when he's wooing her!