I have a friend that does this, meets guys, sends out mixed signals, chats with them til all hours, goes for lunch, and then, when they come on to her, is 'very surprised' and retreats home to her husband.
It is ridiculous to pretend as if it never occured to you he might want more than friendship, even if you wanted to be friends yourself, it would cross most people's mind, especially the way you met.
I hope OP that you got what you wanted, which let's face it, was an ego-boost. Of course you can't have male friends who take up significant time and energy away from your marriage, just as it would be unhealthy to have female ones doing the same.
If the potential to be 'just good friends' was there in every meeting of men and women, then there would be no affairs, would there?