Thanks, these are good questions.
Dots: Right now green covers both “nothing known” and “tested and looked healthy”. Yellow and red already have their own shapes (rounded square with “?” and diamond with “!”), but green is just a plain circle. A small checkmark or a label for “examined, nothing found” would make the difference visible without relying on colour. I’m noting that down.
Diary: At the moment it only records that something happened (“fell in love with X”, “had a row with X”, “broke up with X”), not why. I agree that showing the cause would make the relationships feel like part of a person instead of another status meter. That’s something i’d like to look at for a later version, but I can’t promise it yet.