Neville was slightly deafened by the sound of his own heartbeat in his ears. It was a good thing they didn't say anything because he wouldn't have heard it anyway.
Though he did hear Ginny's gasp at his hands, making him look at them and honestly, he'd forgotten about them. "Wha? Oh... I was in the greenhouses and ... got caught up." He managed a small weak laugh until she'd hurried off into the bathroom.
"I tried to heal them but..." He shrugged and watched her, not even bothering to take off his coat. Neville sat and waited, not wanting to do anything that would upset her again. He even dismissed saying anything like 'I miss you' since phrases with 'I' and 'You' at the beginning and end didn't seem to be working very well for him lately.
So he just sat and watched Ginny when she'd seated herself next to him.