The tale of Karlie Kloss and Taylor Swift

So as you can tell I've started a Kaylor fanfic, although I will continue my previous one. I'm just getting started so I know the chapters are short. Here's what it will be about:

Taylor has loved Selena for ages now, they've been through everything together. They're so intertwined into each others lives that they don't know how to survive without each other. They'll always be best friends and lovers.

Until a green eyed girl comes along with her green eyes and charming nature. She's gorgeous, she's funny and they get along so well. The only problem is, Taylor starts to fall for her but she can't lose Selena. Does the green eyed model feel the same way or is it all in her head? Will this end the everlasting love between her and Selena?