Why did you leave? (Iwaoi)

SEVERE TRIGGER WARNING : SELF-HARM AND ABUSE PLEASE BE CAREFUL IF YOU ARE UPSET EASILY BY THESE THINGS, AND SEEK HELP IF NEEDED! Oikawa regrets just about everything he has done in the past week. That doesn't mean he'll stop. He wishes Iwaizumi never left. He never even said goodbye. He knows the habits he has develop...