What does it mean when you dream about someone?

Last night i had a dream about a girl that i once liked, In the dream I was at her house (which strangely looked like mine, probably because i have never been to her house before) and was just waiting for something. Then I saw her walking down the stairs in a beautiful dress and looked all extra pretty, then she asked me what do i think, before i could answer i woke up. I find this really weird because I kinda of like someone else now... What could this mean? Was this just a plain weird dream? or is there a meaning to it?