This sentence is usually interpreted as an evaluation of a girl's confidence, but the specific meaning varies from person to person. In some cases, this sentence could be a kind of affirmation and encouragement. It meant that the boy was confident in the value and ability of the girl and thought that the girl had a high possibility of getting married. In other situations, this sentence might be a sarcastic or mocking hint that a girl can't get married or isn't beautiful or good enough. In addition, this sentence could also be a smokescreen. A boy might say this sentence in front of a girl, but in fact, he didn't believe it or care about the girl's marriage. Therefore, the meaning of this sentence needed to be judged according to the specific situation and tone.