Why would he tell me this? And how do I get him to stop?

I'm a parts advisor in a dealership my male coworker has told me on multiple different occasions that he stares at my boobs for example he told me one day that when I pulled my pants up that my boobs giggled and he was looking he's also admits that he likes when I wear tank tops because they slide down and then my chest shows a bit.. I've tried to avoid clothes that show off my body but I've never had someone confess that they stare... mind you his fiance works in the same department as us and my husband works in the shop as a diesel tech

Keep in mind I don't care when the techs say things like nice jugs when I hand then coolant or def or say inappropriate jokes and stuff because that's just what happens in a shop but what he's doing and saying isn't just disrespectful to my husband but to his fiance

Why would he tell me this? And how do I get him to stop?
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