Girl led me on. Do i Unfriend her on Fb?

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were both 19 and in college.

2 awesome dates. cuddling in both of them. a kiss on the second. and suddenly she changes her mind about me and doesnt want to date. Shes cold to me in class when i try to act like everything is normal. so i want to forget her because she obviously wants nothing to do with me and im just making her uncomfortable asking her about what happened.

should i do it? and what do i say if she asks why i did?
i also add that she was completely interested in me. then she rejects me because she changed her mind. she gave me a plethora of signs that she was interested. so yes, she did lead me on.