You know, I'd bet the farm that most men do fantasize about others at some point. Now, the real sore spot is that SHE is already a thorn in your side. He likely could have gone w/o telling you this but in the interest of full disclosure he was likely just being honest. I'd bet that EVERYone who has had an EA has taken this step. Just most dont disclose this much detail to their spouse since its not something that can be proven. I would think this is completely normal. You just have the added misery of who she is. So sorry for that. Im sure thats something you could have gone forever not knowing. My bigger question is did he disclose this only when pressed by you or did he volunteer it?