I'm going to explain some personal history, ok?
13 year old SF has two friends, A and B. B asks SF out, and SF goes out with B, flattered that someone loved her.
Well, after a few weeks, B starts treating SF differently, saying stuff like "kiss me, bitch, this is how this works." SF is offended and dumps B, but still wants to be friends.
1 week later, B leaves A and SF entirely. A hates B passionately now.
-One year later.-
A and SF have still been friends, but around Halloween, A forces SF into dating her. SF, scared from before, doesn't want to date A, but doesn't voice this. SF is miserable.
After 3 months, SF gathers courage to tell A the truth. A says it's fine, and SF can date her again whenever she is ready. Things are fine for a week.
A begins treating SF differently recently. A is nice to other peers, but only points out SF' s flaws. SF's self confidence goes down the drain.
Then, A starts being a part of different groups, but reassures SF that she won't force her beliefs on anyone. Days later, A starts slandering SF for not believing the same things.
A thinks they are superior for being lesbian, vegetarian, atheist, and liberal. A thinks SF is all these things, but SF is not.
A mocks the opposite of all these things, trying to make SF go her way out of shame.
SF feels alone and scared. A has been alienating her from other people.