Snookums & Catfish

I call my bf snookums and he calls me catfish. I told him that if he called me catfish that I would call him snookums(b/c I didn't want him to call me that and I figured that he wouldn't if I called him that, BUT I WAS WRONG) one night, and he said "okay, catfish". I thought great. And now that's all he calls me.