The context of the following conversation is When they got mad at their girlfriend, Casey destroyed every item their girlfriend had left at Casey's home.:
Casey says I don't think I've ever been so mad before in my life!.
The friend responds What happened?.
Casey responds I tore down all of the posters in my bedroom, threw away my record collection and got rid of the lamp too..
The friend responds Why on earth did you do all of that?.
Casey responds Those were my girlfriend's things, and last week I learned she slept with another guy..
The friend responds Yikes! I'm so sorry. No wonder you're mad..