Chase: you didn't want to because ever since you got a bow and arrow put in your hand he would keep making sure you wouldn't get hurt but you knew you could protect yourself. You both still loved each other after but you both thought finding someone new would be better.
Adam: you lost the love. You knew before you dated he had a crush on a girl but then with him spending more time with her you thought he loved her more than you, and he did.
Leo: you were arguing way too much and you both couldnt take it anymore.