Girls who broke up when the baby was still very young, how did it affe…

Girls who broke up when the baby was still very young, how did it affect them? And what's the right thing to do, please share your opinions? The situation is that we want to break up with our husband, we have an infant together, we've been driving each other crazy for years, and we know and have been friends for 10 years. But something's not right anymore...but he takes responsibility for the son as a father. We aren't officially married, but in terms of his son, he stands as a father. What should I do, how should I be? There's nothing bad between us, but we're already so close that no rest will help, and we want to