You fell for todoroki but he fell for you too late. At that point you were dating Katsuki unfortunately that relationship ended because of his pride so the two of you became strangers. Years later at the class 1A reunion both boys realised that they never truly got over you and both want you now. Unfortunately they are in a silent competition with one another to win you over. (This is a Katsuki x you x todoroki story you can technically get with them both or choose one or none 🤷‍♀️)