Here's some useful vocabulary before you listen to the song:
Love on the brain: when there is something that we can't stop thinking about, we say I have **** on the brain.
fall apart: literally this mean to break into lots of pieces. We can also use it to talk about your mind, if you are having lots of emotional problems and you can't think well or do anything.
put me together: when something falls apart, you can fix it by putting it back together
Don't quit loving me: this is exactly the same meaning as the previous line, don't stop loving me.
fist fighting: fighting with your bare hands (a fist is when you clench your hand ready to hit something.)
beats me black and blue: hits me until I have a lot of bruises (in this song it's not literal, she is talking about being emotionally beaten)
I can't get enough: I always need more
it keeps cursing my name: keep + Ving is very useful. It means something keeps happening again and again. For example, I keep losing my keys.
Cursing my name means that love is not working well for Rihanna, it's only going wrong, like there is a malediction on her.
I'm tired of being played like a violin: I've had enough of being fooled (in love)
Here are the lyrics for you to sing along to. Enjoy!