What is the intention of my girlfriend to show me the short messages that other boys have confessed to her?

Two possibilities! First: I want to see if you are jealous and how much you care about her! Second: I want you to know that if you treat her badly, she can always choose another man, and there are many people who like her! Hehe, tell her to break up with another person. Tell her you're jealous. Don't be shy!