Girls, I need your insight on what’s going on and if I’m panicking or is she seeing someone?

So my best friend told me she had feelings for me and I told her I liked her back and we kinda feel into a situationship bc we don’t haven’t made it official. Thing is I don't know what to do bc since then we’ve only got to hang out when she needs help with something and she was sick and I went and took care of her…after she started feeling better and just overnight she barely talks to me at all and I’ve been trying to give her space but that just seems to make her feel more distant. It’s only just been a week of silence but it has me worried bc she is my best friend and we never been this way. We did meet up at a WH after a concert we went to but separately and she acted like nothing has changed and treated us as the same but she was also on her phone a lot and acting a little protective of it and it has me worried she’s talking to somebody and hiding it from me. I don't know what I should say to her or how much more space I should give or just leave, but I don’t want to lose my friend but my mind is telling me she lying and using me now.

Girls, I need your insight on what’s going on and if I’m panicking or is she seeing someone?
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