Provide the theme summaries for the following conversation: 

Andrea: Have you heard about Mitch?
Rebecca: No, what happened?
Andrea: He broke up with Melanie!
Rebecca: Are you kidding me?
Andrea: No, it's for real! I couldn't believe it! They were supposed to get married next month!
Rebecca: What happened? I don't know, rumor has it Melanie cheated on him!

Summary: 
Mitch broke up with Melanie just before the wedding because she cheated on him. It's hard for both Andrea and Rebecca to believe it. 