Marcus was grateful that the other man had taken the hint, as well as the girl's hand. His own family had definitely not been the huggy sort. Voluntary physical contact that wasn't of a sexual or violent nature was kind of alien to him as a general rule; he just didn't know what to do with it. That was why he'd been fixated on her being hurt. Something that required first aid. A problem that could be solved, a very clear list of tasks to perform. It wasn't that her emotional state frightened or even really bothered him that much. He just didn't feel qualified to deal with it. Not like a friend would be. Luckily, Finn was there to do it.
Marcus didn't respond to her apologies verbally, just nodded, realizing he wasn't going to be able to stop her from offering them. Embarrassment he got all too well, actually, being someone who'd rather get himself eaten by zombies than let anyone witness him break down. Women were allowed to do that shit, though. Pregnant women probably even moreso. Marcus wouldn't hold it against her, or judge her for it.
Once everything was back in the box, he straightened. He hesitated a moment, wanting to ask if they got this, maybe tempted to stay and make absolutely sure that she was all right. Maybe even carry the box for her while her friend walked with her. His motivations never surfaced, however. Neither did the offer, for that matter. Her friend had a hold of her, and would see to it that she and her things were taken care of. Marcus decided that the best thing for him to do would be to walk away without saying anything more to either of them.