No, bosses aren't always men. I had a 50/50 decision to make and chose randomly, please try not to be faux offended.
Yes, I know what disingenuous means.
No, they're no different. OP feels an 'emotional, intellectual and physical connection' with this wonderful person and can think of nothing else.
Who are you to say that my hypothetical exec doesn't feel that for his secretary, or the guy doesn't feel that magic when he meets an amazing woman who outshines his wife, or that the woman doesn't feel that every time she falls for a new man?
You're trying to attach significance to something both predictable and common, as if it is special in some way.
If it's so special put your money where your mouth is - leave and start a new relationship.
Her DH doesn't deserve to be in a competition he doesn't know he's in while OP test drives her shiny new toy.
Imagine being him - detecting an emotional distance but not knowing what's wrong, trying harder but sensing he's failing, being unaware during intimacy that he's sharing her, planning trips while OP increasingly imagines doing those things with someone else.
Read a few threads on here if you want first hand testimony. Being left without warning is devastating, later finding out that it was because there was a third person in your marriage makes it many times worse.