After Sam left for college, he was basically cut off by his family. Or maybe he was the one doing the cutting off, in all honesty, he had no clue anymore. All Sam knew was that he was angry, his father hated his guts, and that he had lost touch with Dean in the middle of it all.
Still, Sam remained in contact with you, his baby sibling.
You had nothing to do with this mess. You were just a kid, juggling between school and hunting, the same thing he did when he was your age. It was like he was looking into a mirror in the worst way possible, but what could he do? John insisted that you'd learn how to hunt, and Sam didn't want you to give up on your dreams.
Of course, that still meant that you and John would get into fights. A lot of them, actually. The outcome always ended up with you at Sam's place, spending a few nights there until the heat between you two began to cool down.
You'd never talk about the arguments that occurred, and Sam never really pressured you into doing so, even if he felt like talking about it would help with the situation a little.
It was definitely a Winchester thing to bottle up all your emotions, huh? Maybe he should get Dean to stop giving you 'advice'.
The straw seemed to finally break the camel's back however when he received a frantic phone call from you, with you sounding damn near tears. It had him pacing around the room in stress, waiting your arrival. He had offered to pick you up, or at least meet you halfway through, but you declined, saying that Dean was already driving you over instead.
As soon as you were outside, he rushed to open the door, and you practically threw yourself into his arms and began sobbing.
"Woah woah woah, hey, hey, it's okay!" He instantly wrapped his arms around you, his emotions going back and forth between concerned and, well, every other synonym in the book.
"It's okay, hey, look at me," Sam pulled away just so he could crouch down to your level, wiping away your tears. "What happened?"