Open Question: How do i prevent the spread of Mono?

Here is the deal, pickle. Prom is in 2 days. And with my luck, I've caught Mono. Form where? I don't know. First guess would be my girlfriend, but she isn't sick. I'm not a player, so i haven't kissed any other girl. But how i got it isn't the problem, its how to not spread it. The doctors say its very contagious, and with my girlfriend wanting to leave the country this summer for vacation,