@coworker,
There's only one person that can clear this up, you.
Weigh it all up, an affair "of any sorts" verses your marriage, or loss off due to it.
If you can get your head around your heart instead of excitement, then you can go away with full knowledge within yourself, that it's "ok", because you are married, and love your husband.
If not... then you will do what you will do. Which is a shame, as everything needs work in life as well as a real chance.