Thank you for bringing your question to Just Answer!
It sounds like he's making some really bad choices. Keeping your email is a sure way to get caught by his wife, someday. Most likely he needs the ego boost that your emails gave him, and is keeping them to read when his wife doesn't pay enough attention to him. He's clearly intrigued by the fact that you approached him...maybe nothing like that ever happened to him before. It sounds like he's fantasizing about you, but isn't willing to risk his marriage to see what would happen. I'd suggest putting a block on his phone number, and consider changing your email address so if his wife ever finds the emails, you won't have to worry about her finding you, and confronting you. Even though you're perfectly innocent---she won't see it that way.
What a great saying...I'd not heard that one before.
I didn't mean fantasizing in that way...but now that you mention it, I suppose it's possible. But remember, it's not actually "you"...because you never gave him anything physical to use in his fantasies.
But really, I meant that the ego boost of having an attractive woman ask him out will probably warm his heart for years to come.
Don't lose a moments sleep worrying about this...we never know what people are thinking about us, and it's better that way.