Told boyfriend I will be fantasizing about other people too!

I deleted my previous post. But basically my boyfriend admitted to fantasizing about other women while on the train. Someone posted telling me I should say to him I do the same thing and see how he feels. And this other thing that he kept doing which I forgot to mention in my initial post was that when you would watch a movies or a TV show with me and a hot girl appeared. He would look her up online to look at her pictures and I'm assuming to fantasize about sleeping with them though he denies it. He did it when we watched game of thrones and the white haired dragon lady came on. Anyway,So basically I told him that I'm going to be doing the same thing he does and fantasizing about other men. And there's a particular man I'm interested in doing it with. He looked very sad about the situation but then admitted that "okay I'm wrong in doing it myself. And I'd be a hypocrite to say you can't". And I'll let you do it for 2 months and I'll stop doing it myself. But After two months you can't do it anymore. I agreed to the arrangement. But keep In mind I don't really have any plans to do it. But I just wanted the satisfaction of making him feel hurt and insecure for a change.