Star-Crossed lovers

Delilah and Sam were one couple .They were happy and enjoyed every bit of each others heart. But that all changed when Sam began to have feelings for another girl named Carmen. Delilah wants Sam back but she doesn't want to hurt Carmen.
Will she get her lover back? or will things take a tragic turn?
( all characters are OC's so please ask when using them in a story also this is my first story so sorry if its bad)