Help everyone thinks I'm a !?

Okay for the past couple of weeks I've been secretly making out with this new friend of mine's named Amber. We aren't s or anything we just like making out with each other. Today we skipped cl and went into the girls bathroom to make out and another girl at school walked in on us. By the end of the day, theire were rumors going around saying that I was a and my boyfriend found out about them and he's not speaking to me. It's completely untrue and I'm mortified and don't know what to do. Please help!