Your threads are confusing. This was first described as having to do with a guy in the corporate office. On your next thread, it was your husband. Really? not just your boyfriend? Why would you describe your husband as a man at the corporation?
In any case, you seem not to be the only woman he is interested in.
Whether or not you are married to him, his conversation with others is his business. You do not own him.
If you have made vows of fidelity, it is important if he is fooling around, but still, what he says to other people is his business.
Somehow I doubt you have made vows of fidelity, but perhaps I'm wrong.
It sounds more like you are a nosy girlfriend.
We don't know enough to judge either him or you or "the mistress" called Sweetie.