They Both Die At The End absolutely ruined me and here why (Spoilers!)

Basically, i just finished they both die at the end and it absolutely wrecked me. It was so sad and the way that they died is so heartbreaking. Mateo shouldn't have left and then gone and died and then rufus literally stepped on his burning corpse then literally basically killed himself. I'm so distraught I don't know how to live anymore. I have the prequel I'm gonna read but holy moly that was so sad. my sister and mom and brothers were laughing at me because of how much I cried. 10/10 though I loved it. I'm such a wreck right now. they overcame so much then that happened I'm so done.