In that case, it would be better for you to rehome him. I'm sorry. Not trying to be mean, but as I said, they are social creatures that need the company of their own kind. They are not like a dog that will adopt you as their pack mate. Two ducks is not that expensive to maintain.
For the...
The bill colour is normal for a white Muscovy. The amount of carruncle growth (the red fleshy part) and the head shape makes me think male, but I could be wrong. Males will become quite large, up to 15 lbs and sometimes more. Muscovy are known as the Silent Ducks, because they do not quack...