People break up for all sorts of reasons. Sometimes it happens because two people have grown apart and have come to an honest decision about the state of their relationship.
Other times, it's because someone chews too loudly.
You have to be honest about the petty breakups, and that's what Reddit is for. People over there are admitting to their pettiest breakups, and it is so entertaining. Enjoy the schadenfreude and bury that pettiest breakup deep inside you.