It's really complicated and she won't communicate. What does this mean?

Anonymous
I (F18, supposedly straight) met a girl (F18, bisexual) 3 months ago when I started college. We got along really well really fast. We're in the same friend group and I am also friends with her girlfriend.

We got along really well that she would text me everyday asking about how my day was, give me hugs every time we said goodbye, ask me really sexual questions, and is constantly touching me. However, whenever someone asked where she was on days she was with me, she would lie and say that she was alone (which doesn't make much sense since we're all friends).

Eventually, I started to develop feelings for her even though I've never liked a girl that way before.

She asked me one day when we were having dinner if I liked anyone, and when I said yes, she started to distance herself from me (at this point, she thought I was 100% straight). She would keep asking me who I liked but she would get more distant when I would avoid traits that would lead to her.

Recently, I did reveal that I like her romantically but she simply said "you know that nothing can happen because I have a girlfriend but I wouldn't let this affect our friendship."
Because some of the things she did with me didn't add up, I asked her questions about why she would be so upset when we talked about who I liked. She answered "because I didn't know who it was and it was stressing me out to a point where I couldn't stop thinking about it." I told her not to worry about me crushing on her since I'm going out to get drinks with my friend anyways and it shouldn't be an overbearing crush. She responded "don't go find someone else, just wait naturally until it fades away." (the audacity, right?)

Since then, she has been avoiding me completely and I don't know why.
It's really complicated and she won't communicate. What does this mean?
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