The girl who laughs and talks a lot and seems very happy, can also be the girl who may cry herself to sleep

 Let me refresh your memory a bit.
I was the one who listened to your problems.
I was the one who took your bullshit.
I was the one who actually cared bout you.
I was the one who stuck around even when everyone told me to leave.
I was the one who stood up for you.
I was the one who loved you even when you gave me every reason not to.
Lastly i was the one who was there for you when no one else was.