Why would a girl ask if I have a girlfriend?

So the girl I used to talk too asked the week before Valentine’s Day how many girlfriends do I have now. Then a few days later she asked me again, then I told her I had a girlfriend and she told me she didn’t want the same thing to happen again ( my girlfriend is very territorial). Anyways then I told her that her aunt keeps pushing me to date her and she told me she not interested in me that way. Should I believe her or not? Why would she keep asking me if I have a girlfriend.

Why would a girl ask if I have a girlfriend?
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