What would you think if you went to your husband or wife FB and they hide their relationship status?

[Daniel Harmon]

I think you should talk to him about it. From the phrasing of the question, it seems you already have your "most probably" conclusion; it will do nothing to give you an answer other than the one you have already arrived at. (since you did phrase the question that way) No one will know your relationship better than you two, and you should probably know right away when confronting him whether your suspicions are warranted. Some advice that I would give would be when confronting him, give him a clear sign of what you think (even exaggerate it a bit to get his quickest response).

Also, to keep any relationship between two people truly between those two people, concerns with that relationship should be only voiced between the partners. Just like every business is unique, every relationship is also unique. Asking advice from other business owners who deal only with their unique business gets advice that doesn't pertain to your specific situation. You don't even know if they have successful businesses.