“FOUL TEMPTRESS”

Okay. A year ago one of my guy friends asked me out and we went on one date. After that I decided to just be friends for the time being. He recently asked me out again and we’ve been getting just a little more serious. I noticed a couple days ago that my name in his phone is apparently “FOUL TEMPTRESS.” Should I take it as a joke and roll with it, or do you think he’s being an ass? I’m kind of hurt by it, especially considering he’s one of my closest friends. 😬