Dreamt the girl I like told me she likes me. What does it mean?

In my dream, I was just sitting in a hall. I saw the girl I like walk into the hall with her friend. She looked at her friend, said something and then walked to me. When she came up to me she randomly said "I like you" without saying hi or my name. She stood there for a second longer, turned around and walked back to her friend. I walked up to her told her I liked her back and organised a date. What does this dream mean?

I think this dream means: you like that girl, and you want her to like you, you hope she likes you, and maybe even you think she likes you. It does not necessarily mean that she actually likes you: she may or may not like you. The best way to determine that is in waking life.