Alright, here's what I would do with this. I thought about how to get over this situation, after all, it's an apocalypse and they are in a bunker. Options are limited so sometimes when one is hungry and there is food, one eats without questioning. However, looking at the photos, I think Willow is awesome. Who is the guy in the white coat? If I'm playing this, forget Amos. We all make mistakes but Willow, your Freudian id is telling you that you want that guy in the white coat if possible. Leave Amos blinking and make out with that other dude in white unless there's some fact I'm not privy to that interferes. The future of the planet depends on you.
Haha, in seriousness, if you want Willow and Amos to get back together, draw it out a bit. There should be some arguments but they are still attracted to each other because she's attractive and he's a guy in a bunker with her. He will forgive her. Mix some arguments and flirting. They can get angry but still be into each other. Really though, she has her pick of any guy in that bunker. Where are they going to go?
There could also be some sort of group intervention about him because they all share that small space together. So, she and the others could work together to help him to improve and to cure him. Can he earn rewards traits that will help him to have a better personality? Maybe send him volunteering for good causes if you have Parenthood. Have him donate to charity. I don't like the type of plot where he changes because of her but in the scenario that you are describing, I could see the group of these survivors deciding that he needs to improve and be cured or be sacrificed because they can't keep a sick sim in the bunker. He's deadweight to the group if he's not helping and they don't want to risk getting sick from the contagion. If Willow really cares about him, she needs to be direct with him about whatever his problem is.
