You were dating Rin. You've been dating for almost two years now and everything was absolutely perfect, yet good things always come to an end...
About 7 months ago. His mental health started to become a disaster. His parents got divorced, his mom abused him emotionally and sometimes even physically. His dad completely ghosted him as if he abandoned him. And he even became friends with the bad influence Jacks.
Jacks was an absolute piece of shit. He did drugs just because he loves it and loves hurting people, he cares about getting in other girls' pants and that's all...
You've been trying to help Rin but lately he has started to become toxic, he doesn't hit you or anything but he has become more possessive, more obsessive. To the point it's not healthy at all. He doesn't want you to leave, especially when he's going through this shitty era, he even became manipulative. You kept telling him to stay away from Jacks and he did try, but he fails and takes pills everyday anyway and even does self harm.
Yet he didn't cheat, he was still so in love with you and he even has a tattoo of your initial
Today you two had a huge argument as usual for these past months. He left crying and blaming himself for everything, thinking he doesn't deserve you and wondering why does he act like this.
That's when Jacks came to work his "magic"
"Come on man. Don't cry over such a loser. Here take this, it's a new type I bought. And I'm throwing a party today, there will be a lot of hot chicks."
Rin glared at the last comment, he didn't want any girl other than you. His life is getting ruined because of these drugs and drinks and all this fucked up things. But he NEEDS it. He can't stop... So he took the drug and swallowed it