Question: what does it mean when someone puts an x at the end of their sentence?
Answer: As you may know, X is commonly used at the end of a message to represent kisses. Similar to Xs and Os (kisses and hugs) in North America, however X can be and is often used by people of varying familiarity (platonic friendships, siblings, crushes, dating, married, etc.) Usually more Xs means more familiarity.