You are going to have to tell him. The best way is to just tell him the truth. You say he knows about the girls, so that should not be a problem. If he loves you he'll stick by you. This may be the first test to your future marriage.
He needs to know, don't wait. It is also possible that he has symptoms and is being treated. You don't and won't know until you tell him.
It is also possible that you caught it from him in August. So, you both really need to talk, now.
Hope that helps.
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