What do you think about this?

I have this best friend named Nicole. She is 17 years old. She has this ex boyfriend named Devin. He's 18 years old and he's a singer in his band. They broke up because Devin cheated on her. Devin tried to get Nicole back but she just rejected him. Devin has four band mates. They're all really close. After Nicole and Devin broke up, Devin's band mate Garrett was there to comfort Nicole. They became really close that some people would mistake them as a couple. That went on for about 3 months. Nicole has told me herself that she likes Garrett more than as a friend. Garrett told me and Nicole that it bothers Devin that he's close friends with us. Last week, Nicole told me that her and Garrett are finally together in a relationship. But it was a secret. Garrett only told one of his band mates about it. Later that week, there was this picture going around of Nicole and Garrett kissing. They don't even know who could have possibly took that picture and started spreading it. It reached Devin and now he's in war with Garrett. Devin wanted Garrett out of the band but his other band mates won't allow it especially now that there is a label interested in getting their band signed. Last Saturday, I heard that during band practice Garrett and Devin had a fist fight. If their band mates have not been there it would have seriously gone out of control. Do you think it would be a good idea for Nicole to continue dating Garrett? I know that Garrett and Nicole really love each other but what if I get them to break up so that there would be no more fighting and everyone lives happy. What if I get Nicole drunk and get her to make out with Garretts brother during a party while Garrett was watching? That would surely break them up. Garrett's brother is only a year older and I heard he thinks Nicole is hot so he would definitely kiss her back. What do you guys think?