Why do guys lie to girls?

Anonymous
(Before I start this, I’m not generalizing and I’m aware that women lie too. I’m just speaking by experience)

So my 2 male cousins are friends with this guy that I like, and they both told me months ago that he likes me.

But comes to find out, he talks to them about girls he’s been with and sometimes they would all mention other girls right in front of me. (And they know I like him back) Whenever I ask him or my cousins about the other girls they either sugarcoat or act like they don’t know what I’m talking about.

But why bring up other girls right in front of me thinking I’m not paying attention and then cover for him so I wouldn’t know anything? I get it’s none of my business but if they don’t want me to know then they shouldn’t bring up brief things that happened with other girls. But they say he wants me. And he stares at me a lot.

The way they make it look as if he’s a guy that just sleeps around so if my cousins knew that about him, why try to get us to date? It’s unfair for me because I’m looking for a relationship and they lied saying he wants one too when he actually doesn’t.
Why do guys lie to girls?
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