A: (here is an example of a question mark (?) to make a statement with a question mark you must be asking a question for example: "Is this BRAINLY?" that would be the proper use of a question mark. You may also use it if your not sure of something. Example: "Sir, are these cupcakes $1.50?" Questions mark main use is to ask a question. That is why the question mark, is called a question mark.
I hoped this helped you understand question marks.
According to this paragraph, I would say that the tone is sad and informal. It could be considered sad because of her personal experience. How she also felt when her first boyfriend left her for another girl.