10 points. Lots of detail and answers. Thanks so much!?

[Brendan]

First off I have had a crush on this girl who is beautiful and smart and she brightens up any room and I've had a crush on her the second l saw her 7 years ago and I'm 17 (10 years, math done) and we casually talk at school very little. I talk to her sister through snapchat and we are good friends. Recently her sister asked if I liked her and I confessed. Thankfully her sister has promised to keep it a secrete which I'm glad about because well after 7 years this would be a terrible ending. Now my crush started snapchatting me-I have no idea how she knows my username- and we talked for hours. Finally she said good night but will it end there? What are the odds that this will continue? Any idea why this even started? From what I understood she put in a lot of effort into the topics which was very interesting. She chose to keep the conversation casual yet spontaneous at the same time for people who rarely talk to each other (we are on good tea by the way). Any ideas are appreciated thanks