What does it mean when a girl who you like shares a dream about us having sex. And we had a sext conversation and exchanging nude photos. She has a boyfriend. The next day she tweeted on twitter about how much she loves her bf. I'm confuse?

Sounds like she's a pr**k. And you're being used. Sexting is a not so hot way to put yourself out there.  I'm not sure what you know about media. But scandals can come back to bite you in the butt later in life. Lets just hope she deletes the pictures rather than posting them for the world to see