Cancer. I must justify. And they probably hate this answer the most than any sign because they genuinely put effort into the people around them. I know many, since many years. They are not bad people just very difficult people to get along even when they like you, another issue entirely if they don't. If they like you they constantly seek your approval. If they are in a room with you, you cannot get lost listening to music or read a book, they constantly will look for interaction. If they don't like you, they will never be "live and let live," they play passive mind games, which can make you hard to ignore them. They are also openly unfair.
I once knew a Cancer person who admired a famous celebrity. Since we live in the celeb's city, we happened to not only meet them but also interact. Now artists/writers are generally moody people, so the rest of us kept our polite distance, but my friend just was openly showing all admiration and constantly demanding their attention. Now to be honest the celebrity was very kind and entertained this exhausting attention for a long time, but later began hinting that he needed elbow space, but my Cancer friend was blinded in worship. The celeb finally had to make faces and ignore him for him to get the point. I understand that despite being a celeb, they are human too and have a limit to their patience, and no minus points to the celeb. But once my friend got what the writer was hinting, he began a passive aggressive game with the writer, ignoring their instruction, eg, "I want this setting on the sound system." Fortunately the others covered all this.
It has been 15 years but my friend still doesn't understand the issue objectively and hates the writer. (Literally threw his books in the dumpster, someone else rescued the books.) His professional life also goes through extremes- and so do the other Cancerians I know, they cling to someone, spend 24/7 with them then a cold war begins. But I also know some who are extremely practical and use their innocent, vulnerable faces to an awesome extent, even becoming a millionaire.