That's to say...being abused turns you into a selfish person. I considered changing the headline so it would be less "sensational" (not my original intention) but I'm selfish :P
Abuse causes a person to be very inwardly focused. It's hard to think about donating to charity when you have the ring in the ear and the sting on your face of a decent right hook. It's even hard to notice the homeless person begging for food when you walk past him with the recent diatribe echoing back and forth across your skull.
It's like each painful insult, physical or emotional, condenses your world a little more until you feel like you've been shrink-wrapped and you can barely breath and everywhere you look you find a funhouse mirror with your distorted reflection.
If you talk to people, you can't even focus on what they are saying. You're thinking about how your hip hurts or flinching when they say something too loud. Certain sounds remind you of what has happened to you or what could still happen to you later.
You, you, you. Someone tells you their problems and you wish you had those problems.
And it's all ironic because you aren't really in any prison, but it's hard to accept that on the other side of the funhouse mirrors is a whole big world full of people who aren't you.
And maybe that is why some people stay in the abusive relationship. A place where one other person has made you their entire world where they devote all of their words and actions and suck you into a vortex of negative attention, twisting the idea of you into a grotesque caricature of what a normal person is like so when you finally catch your breath and get a good look at yourself, you're willing to take a good punch to the ribcage just to take your mind off of what you have become.