No, you are married, and in my opinion you do not date someone else while you are married. You pledged your life to one man. Now, that being said, is it OK to think about it, of course, does it make you feel good that another man asked for your number, hell yeah.
It would be absolutely great if someone, not you, could put a little birdie in his ear and tell your h that you were asked for your number the other night, while not telling h, who it is. (do not want to get the other guy in trouble). IT would then be nice to go out again with your friends again this Friday...
Jealousy is a powerful tool, and we all take everything for granted until we almost lose what it is we have.