You and your enemy made an agreement to be nicer to each other. Its because after an argument and he hurt you with words

after a few weeks, its his birthday and you head to his locker to give him an present but you see him and his friend standing there so you wait for them to go away. Then, you heard him talking about you to his friends. „Shes such an distraction, i regret being nice to her.“ your heart sinks
„Everytime i see her, i cant control myself, i keep thinking about her..“