well im no pro at this sorta thing, or never hope to become one.. however i can sort of relate to your situation. I wont bore u with the details, im not gay, bi or nething but just read on..
Clearly this fun relationship, which both of you enjoyed very much took place because at that point in time you were both ready for a relationship. Thats cool, so.. then something happened at ur partners end which made her not look differently upon you, but she had a different agenda. Is this person looking for a real relationship? was something missing?
I believe you would not have posted this note if it was not for subconscious fact that you were found something within her soul that made u a different person whilst she was around you. I hope you look closely at yourself and ake any changes during this festive season that could change your life in abig way, but for the better i believe. I wish you the best of luck in your new adventure!
Take care!