I'm working on planning what is supposed to be a semi-realistic multi-chapter, two part story about a group of high school kids. The story will focus on each of them individually at some point in the story. In part one, one of the main characters starts cheating on his long-distance girlfriend who is away at college. They met through his younger sister, who is close friends with the boyfriend and also another main character. The older sister/absent girlfriend (I'm going to call her AG from now on) isn't present for a lot of the story and none of it/almost none of it is written from her pov. It is acknowledged, however, that both girls have mental problems (depression, social anxiety, that kind of thing) and that AG's are not treated. It's also mentioned that AG is having a tough time at college. Either at the end of part one or beginning of part two, AG finds out her boyfriend is cheating on her and she commits suicide. In part two, one of the major issues is how the characters deal with AG's suicide. Is this too complicated or unrealistic for the story?