Nervous! Help!

My boyfriend and I are taking a little break for a few days. He talked to this girl a few times. Just as "friends." Now I'm hearing that she's saying she's excited we're broke up. And she said she's going to date him now. I won't be in classes tomorrow because I'm sick. But she will be there with him. I trust him. But I'm really nervous. And I don't know what to do. Can someone please help me?