I didn't realize the world revolved around you

I'm not going to lie. Some of Rihanna's songs are pretty catchy (I'm thinking "Pon de Replay" and "SOS"). What I want to know is: What possessed her to release "Unfaithful"? Check out the lyrics:

Cause I know that he knows I'm unfaithful
And it kills him inside
To know that I am happy with some other guy
I can see him dying

I don't wanna do this anymore
I don't wanna be the reason why
Everytime I walk out the door
I see him die a little more inside
I don't wanna hurt him anymore
I don't wanna take away his life
I don't wanna be...
A murderer

What was that Rihanna?!? A murderer? Please, go on.

Our Love, his trust
I might as well take a gun and put it to his head
Get it over with
I don't wanna do this
Anymore (anymore)

Excuse me? Don't you think it's up to him to decide if you have that much of an effect on him?

These lyrics are absolutely ridiculous. In Rihanna's defense, I don't think she wrote the song. Still, she did agree to record it. What was she thinking?