Why did my bestie get silent when I turn her question around to her?

Yesterday me and my bestie, Shelby, got into an argument mainly I started it because I didn't want to hang out with her after she ditched me for someone else but she literally told me THAT SHE WOULD NEVERRR!!! I felt heartbroken and betrayed but I was being selfish... I want to apologize to her tomorrow once I think but today i want to someone to explain why she did this:

Me: "I don't want to hang out with you right now... I don't want to get clingy to you..."

Then she said, "then unfriend me if you don't want to get clingy!!"

I didn't want to unfriend her since I kind of... have a crush on her... so I said

Me: "since you mentioned that, why don't you unfriend me first?"

She got silent when I said that so I decided to keep quiet too. Why did she got silent all of sudden?

Please help!

Note: we are both online friends and both females. I'm not sure she's into girls. But she really do like to hang out with me, she always invite me to hang out with her.

Why did my bestie get silent when I turn her question around to her?
Post Opinion