Dating

What does it mean when a guy says don't tell anyone about us?

Uhm I don't know what it is about me that I keep attracting assholes like literally the same people in different bodies 😑🙄🙄 every guy I've been with or talked to always say "don't tell anyone about us" or don't tell anyone we talk... & im just like whattttt? What do u mean? Why are u keeping it a secret or are u ashamed? Like what is it. It's eating me alive just thinking about it & it really angers me simply because I hear it all too often & it's very frustrating. At the same time I'm bad at expressing myself which is why I haven't asked why. Why do guys say this to me? Fyi I'm not fat ugly or have a bad rep or anything & im in fact very pretty so I'm not understanding why everytime I meet a guy they love saying don't tell nobody about us?
What does it mean when a guy says don't tell anyone about us?
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