Who's the one

I do not want to give to much description of the book but it's basically a teen fiction were a girl (Alexis)who's going to junior year in greensville academy has a loving boyfriend (Danny) that's been with her for 3 years and she sees a future with him. All of a sudden a transfer student Trevor becomes her lab partner In science. He ends up losing his parents in a car accident and had no were to stay. Over a couple weeks there friendship grew she offered him to stay with her without her parents knowing. As the year went by they grew massive feelings for each other. But is she's gonna kick Danny to the curve,if so what will he do. Who is Alexis true love?