So my boyfriend's sister (who seems to catch stomach bugs - last time I posted, it was about her as well), caught a bug of some sort. She was miles away from home. She returns the next day. My boyfriend and I get out of the house as fast as possible, and I disinfect my hands and parts of my car. He brought food - I cautioned him not to eat before washing his hands. Oh well. We were away for three days...and he woke up this morning and was sick. Nobody in his household or that was around his sister caught it. Luckily he made it into the bathroom on time. My tummy felt a little off last night, but I am okay this morning, aside from terrible anxiety. I was very clean the entire weekend. As soon as I knew he was sick, I put on gloves and started disinfecting stuff he had touched the previous night, and his things that he had brought over. He has since left. I haven't disinfected my room or the bathroom, but I've shut the doors and will do so soon. Knowing his family, they probably didn't disinfect much, and it surprises me they didn't catch it after the 3-day incubation. I usually make him wash his hands, and there is a definite possibility he may have lied about doing it.
Long story short: Boyfriend's sister caught sv, boyfriend and I left house as soon as she arrived back, boyfriend's family remains sick-free after 3-day incubation period, boyfriend got sick at my house, and I have been carefully disinfecting everything.
My question is, what do you guys think the likelihood of my getting sick are, and why do you think that my boyfriend, of all people, caught it?