Chatting with my girlfriend, she said she had a fever. What am I supposed to tell her?

Of course I care about her. The subtext of saying that you are sick is generally asking for care and comfort. If it is a different place, look up some information and tell her what to do. Pay more attention and spend more time with her. If it's local, it's okay. Just fly over and buy something she likes to take care of her. Will definitely be moved.