As an avid Reddit user, I have seen many posts where people ask if they were in the wrong for ending a relationship. They ask if they were overreacting or for another opinion, but most people should know that they are allowed to end a relationship if they want to for any reason they think is necessary.
You also don’t need a detailed explanation, especially to people outside the relationship. You can break up because you are no longer interested in being with the person or the relationship isn’t working for you. No one needs to know the details.
If you are unsure about breaking up, then wait. Let the emotions calm down and see how you feel in a couple of days. But if you are unhappy in a relationship, especially if kids aren’t involved, then go ahead and break up. Things rarely get better without outside intervention.