What does this mean hamlet play act 1 scene 3?

In this speech, "weigh" means "consider"; the "loss your honour may sustain" refers to what a serious blow it would be to lose her virginity and her reputation for virtue; "credent" means "credulous" or "naively believing"; "list his songs" means "listen to him or take him at his word when he gives you a big song and dance about how much he loves you"; "your chaste treasure open" means exactly what you think it does; and "his unmast'red importunity" means "his uncontrolled urgings or pleadings."