Brianna and her boyfriend used to spend a lot of time with another couple. That's why she was devastated when the other couple broke up due to infidelity on the boyfriend's part. When Brianna told her boyfriend about the split, he responded with "He finally got caught, huh?" She can't believe that he knew about the infidelity the whole time and never said anything to her about it. What else is her boyfriend hiding from her? Is this the end of their relationship too? What do you think she should do?