In all the 3 years of high school you were dating Todd and you were extremely in love with him though one day you had an argument that broke you up, you were extremely sad cause you still loved him and wanted him back. But you also had an ego and you wanted to feed it so you slept with with his best friend, Alex

And you made him jealous cause he still loved you but also had an ego. What you didnt know was that Alex was in love you and has been for a long time so since he got green ligt from his buddy Todd. He asked you to be his girlfriend and you ofc said yes cause you did liked him a lot, but in the back of your mind it was always Todd who you were now "friends" since he was Alex's best friend

The differences between Alex and Todd were visible. You and Todd fought a lot but at the end of the day ended up solving everything while with Alex you didnt really fought and he was making you really happy.... every time you are with him you wish that he can somehow make you forget about Todd and make you focus only on him