Percy and Annabeth broke up on friendly terms because they both realized that they were gay. Piper and Jason broke up on friendly terms for the same reasons. Then Piper and Annabeth started dating and Jason and Percy started dating. Then Leo came out as aromantic and asexual. Also Hazel and Frank have no idea what the f*ck is going on but still support them and become straight allies. The end. Also Nico starts dating Will. Everyone's cool with that too.