Why did it feel good to get girl mad at her boyfriend?

I hired a guy to do some handyman work at my house last night, his gf or wife read our emails and got my number, was calling while he was there but i never answered cuz i didn't recognize the number, when he left i listened to her vm asking if he was here, she had also emailed me, she called again and I answered, she asked if he was still at my place, i said no but was purposely acting like maybe he could be. She asked why i didn't answer before and if I was lying and I kinda led her on for fun and I knew she was getting mad/jealous/tripping but i got pleasure out of it. I am generally a nice girl and have no interest in her man, not my type at all, so why did I do this?????????????