What could be the reasons she asked that?

I was casually chatting with this female coworker I recently started working with (we’ve been working together for about two weeks). She mentioned how these other two coworkers (one she says she is close too) are a couple. I said oh okay. She then asked me in a somewhat interested tone if I had a girlfriend. I said no. She said why? I know it could be interest, but what other reasons could it be why she asked that?

What could be the reasons she asked that?
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