Ooooh, how sneaky girls are. Three examples so you are sure after reading this about how that is not a bad thing.
Just two days ago, I met a new girl. After a couple of mins of attraction building she starts making sneaky questions to find out if I have a gf. When she does (just a plate, I don't consider her a gf, but you can't go around showing your power level to the world), she auto-invites herself to come out with me to an activity I was going to later that day.
Girl from another town, we share friends. She's insecure as fvck about me because I remain distant through texting and all that, I'm only warm when I actually see her. She asks my friends if I have a gf or I'm dating other girls. They are honest with her about me not getting into serious relationships. Do you think she lost interest? Hell no, she asked me to visit her in a couple of days just after that.
Virgin chick I banged in summer, through social circle (peripherical enough to be able to pull out something like this). As I'm driving her back home, she asks me "but didn't you had a gf?". I put my Han Solo smile on and change the subject about how fvcking much I love to drive my grandpa's car (the one we were in) and how I want to buy my own mercedes. Do you think I lost her? Hell no, weeks of texting trying to see me again, which I declined.
So go ahead, don't be afraid of being a DonJuan. They crave it.