One possible consequence could be the loss of both the boyfriend and the best friend. Once the cheating is discovered, the trust in the relationship with the boyfriend will be completely shattered, and the friendship with the best friend will also be severely damaged. Another consequence might be social isolation as people around them may judge the person who cheats harshly.
One consequence is getting caught and facing punishment. For example, in a school setting, it could lead to detention or a failing grade.
There could be social consequences too. In many novels, the characters live in a community or social circle. When the cheating is discovered, the person who cheated and the best friend might be ostracized. Their reputations can be severely damaged, and they may face a lot of judgment from others. It can also lead to a cycle of guilt and self - loathing for the ones who were involved in the cheating.
She could lose her boyfriend. Trust is a big part of a relationship, and once it's broken like this, he might not be able to forgive her.
One consequence could be losing the trust of others. If people find out that you and your best friend cheated, they might not trust you in future academic or work situations. For example, if it was in a school project and the teacher found out, other classmates may not want to work with you two again.
One of the main consequences is the loss of your best friend. No one would be okay with their friend having sex with their partner. Your friendship will likely be broken. Also, it can create a lot of drama in your social circle. People will take sides, and there will be a lot of gossip.
One major consequence is the breakdown of your relationship with your boyfriend. He may never be able to forgive you once he finds out. Also, the friendship between his friend and him will most likely be ruined. There could be a lot of drama and conflict that follows. Your reputation among your mutual friends might also take a hit. People might see you as someone who doesn't respect boundaries and commitments.
Honestly, in such a situation in the novel, one way to resolve the conflict could be through honest communication. The person who cheated should come clean to the boyfriend about what happened. Then, all parties involved need to have an open discussion about their feelings and expectations. It won't be easy, but it's a start.
Sharing a boyfriend socially with a best friend can be a tricky thing. In some cases, it might work out fine if all parties are very mature and respectful of boundaries. But more often than not, it causes problems. The best friend might start to compare her own relationships to what she sees between the gf and the boyfriend, which can create envy. And the boyfriend might start to feel torn between the two relationships. It's important to have clear communication from the start about what is acceptable and not in such a situation.
I'm not sure if there are many novels that are directly titled this way. However, in some contemporary romance novels, there might be side - plots or sub - themes that touch on this. For example, in some chick - lit novels, there could be a situation where a girl is attracted to her boyfriend's best friend, but it doesn't always lead to cheating. These types of novels often explore the boundaries of relationships and the consequences of having feelings for the wrong person.
One consequence could be the breakdown of the relationship. Once the boyfriend discovers the cheating, trust is shattered and it's very difficult to rebuild. For example, in many stories, the boyfriend feels betrayed and angry, leading to an immediate break - up.