You never understood how anyone could think Santana was selfish.
They would say she was ruthless and cared only for herself, which totally wasn't true (except the ruthless part, that was a spot on description of your San).
You would catch people saying things like you were 'Probably just being used by that selfish bitch Santana' or how you 'Needed to break it off quickly before the selfish Latina cheerleader got her talons sunken in too far'.
Those were bad, yes, but the worst by far was when you had heard some girl whispering to a friend in the halls that the 'Whorish Cheerio was selfishly toying with that pitifully stupid blonde who was always following her around.'
At that comment you had turned around, and in a beautiful display of Cheerio callousness, you narrowed her eyes in a glare that would've made Santana proud. You asked the two girls if they had experienced their slushy-facials yet that day, and made eye contact with Puck, jerking your head toward the girls in a clear 'Get them' signal.
Then, you had turned and stalked away intent on finding Santana and had relished in the sound of slushy hitting skin and the gasps of surprise and that sweet feeling of a cruel victory that you was sure Santana knew and loved (you would be sure to ask her when you found her).
It was just something you couldn't wrap your head around (not that you manage to do that most of the time anyway, but you get things when it comes to her).
Eventually, you just decided they didn't know the Santana you did.
They didn't know that whenever you two walked in the halls holding pinkies, it was always her who started it, smiling at you in that sweet way that you were sure was only for you. Or that sitting in the back of Glee after school she would whisper sweet things about missing you all day while everyone else focused on Finn or Rachel or Quinn again.
They didn't know that whenever you fell at Cheerio practice, (which didn't happen all that often, but still) that you could see the concern in her eyes after your head stopped spinning. And they didn't know that she would find you in the locker rooms after practice with an ice pack and some ibuprofen. Or that she would make sure it was perfectly fine by the next day, so Sue wouldn't chew you out for not being in tip top shape.
They didn't know that she would take you out on dates. You would go out to dinner, like you did that one time with Finn, only without the third wheel. Or that she would usually be the one to pay even though she knew you could.
They didn't know that whenever someone said any little mean thing about you, she tracked them down and made them hurt for it, made them promise never to say anything remotely hurtful toward you again. Well actually, they probably knew about that one, seeing as whenever she got through with them they had several visible bruises and even sometimes a cast.
They don't know that she is the sweetest and single most caring person you know in this terrible little cow town.
That she leaves you little notes in your books (sweet or sexy, depending on her mood that day), so when she isn't there to help you and you try to struggle through the assigned work, you come across one of them. This particular one mentions something she wants to do with you and your ridiculously flexible body. When you find it, the deep frown that had been growing across your face reverses and you catch yourself with a giant grin etched across your features. So, before you're even halfway done you text her and ask either to come over and help with your work or to come over and help accomplish what her note stated, a smile on your face just at the thought.
Then she would come over (because really, who can resist you?) you've already given up frustrated and put your work away, ready to do what she had suggested in her note.
They don't know that when you have sex she is anything but selfish.
But maybe you're okay with them not knowing.