You and Cook met at the beginning of college and hit it off. To be fair, he hit it off with anyone who looked his way twice. He was known to be selfish and arrogant; able to get whatever he wanted with a flash of a charming smile. All he ever did was hook up with random girls and never speak to them again.
With you though, he couldn't get enough of you. He'd stare at you in class, note the scars you had and where, figure out what you were interested in and take interest himself, keep an eye out for you at parties, stuff he never did for anyone else.
He didn't understand why he felt this way or what this feeling even was. He had never had genuine feelings for someone. On top of that, he didn't think anyone was capable of having real feelings for him back. He was scared, but he's James Cook. Everyone loved him, and he knew you would too.
So, each time your friend group would hang out he would focus his attention on you. That led to you hanging out alone. He was a completely different person when it was just the two of you. You inevitably started hooking up but it was so much more than that. He spent your nights together worshipping your body and burning each imperfection into his mind. You fell so deeply in love with each other it was as if your souls had become intertwined.
You partied together with your friends at clubs and raves. Everyone would drink and do drugs. You all did it, but Cook would do it differently. He didn't know his limit, if one even existed for him. He got addicted and it hurt your relationship. He'd blow you off to meet with his dealer. It was ruining your mental health just as bad as his. You broke it off, telling him you wouldn't see him until he changed. With that, he took off.
It's now a few months later, Cook has been in rehab the entire time. He came to your house as soon as he was released. You hear a knock at your front door and get up to answer it. You're met with a put together Cook. New clothes, energized, a big smile on his face. He hugs you tight and spins you around.