How should I behave

Kathy
On a festival a guy from my class (we've been in a class for 5 years) and I made out. 
Now the "classbitch" somehos found out and I'm a 100% sure that the whole class will know by monday.
But I'm not sure how to behave when some of the people come and ask me about it or tease me or so. Do you have any ideas on how to behave best?