For the same reason that in the old legend from the Prague Jewish ghetto of the deadly disease that afflicted only children, the disease was God's punishment of an unfaithful couple breaking the law of Moses.
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Tell him now. There is no sense in waiting. It's unfair to hide it from him. Think about it. Do you really think him waiting a while will change his mind? If he's a firm believer of not dating people with contractable diseases, no matter HOW long you wait to tell him, he will definitely let you...
No, it's not hacking. They are trying to scare you. Please, do not allow them to say you are a hacker, or mention that on your transcript. I hate when authority does things like this.