No, no... of course not. You might consider staying on the lookout for more suitable men. A gangbang with (say) six men simultaneously would certainly not be unreasonable.
Not unreasonable at all, just have to find the willing.
Yes, certainly. Recall the definition...
"cuckold: a man with an unfaithful wife."
Whether he knows or does not know you are fucking other men has nothing to do with his cuckold status.
You may, however, find it advantageous to eventually bring your husband to full acknowledgment of it being your privilege and prerogative to date and fuck other men, while he must remain faithful as your cuckold. See, for instance:
How to Cuckold your Husband, Ch. 1:
How to Cuckold Your Husband - How To - Literotica.com
How to Cuckold Your Husband, Ch. 2:
How to Cuckold Your Husband Ch. 02 - How To - Literotica.com
As a start, you might consider becoming your husband's disciplinarian. See, for instance:
DWC Index Page (4)
—Custer