Why the awkward silence?

I was talking with coworkers the other day and something came up in the conversation where one of the girls in our unit was like "oh well, take it to your girlfriend" because we were probably talking about food or something, and she was like "or wait, you DO have a girlfriend right?" and I was like "nope."

Then the girls in the group just looked at each other and the weirdest awkward silence came about. Like it was during the complete middle of the day, we're inside in an office, and it was as if you could hear crickets chirping. lol

My friend that I work with just smirked because he knows how much of a loser I am xD hahaha. But why did everyone get so quiet after I said that I didn't have a girlfriend?
Why the awkward silence?
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