Hunter went to change into his gear: t-shirt and sweatpants which waited for him faithfully in his locker.
Hunter wondered, why is he here? He is not sure himself. After the sports club, he was supposed to drop Mia to Liz's place, wish her a good night and probably not see her again. And he was OK with that up to the point when he realized that she might have her dinner by herself, or worse (with Aaron) on a Saturday night. Before he realized what is going on, he was moving toward Mia in large strides, hoping to catch up before she enters the elevator. He was glad that she accepted his invitation for dinner, but he told himself not to overthink it. The woman likes to eat, and she needs to have dinner. Why would she reject him? It's a free dinner and he knows that she does not hate him, it's better than eating by herself (or with Aaron).