Why do you think so many relationships end in divorce or breaking up?

Why do you think so many relationships end in divorce or breaking up?

Exactly that. So many relationships fail and its sad but what are some common tropes you see that seems to be some core reasons why they fail. I know communication is one whether it be for financial issues, kids, and so on. What are some common pitfalls that are seen in relationships that end to their ultimate demise?

I ask this as someone that wants to be in a long term serious monogamous relationship that lasts till death and I KNOW there is no way to predict it will or to know it will or plan the future but, as much as I can I want to be mature enough now, at this stage and at least have the knowledge of what to avoid when in a relationship through all phases that would lead to its downfall. I know that knowing the pitfalls is different then living them and actively avoiding/going around them/moving passed them in the moment but I want to at this stage do what I can to have a successful happy marriage as it is so important to me for tbe future. This is something I've always wanted in my life.

So anyone that has either personal experience or experts please weigh in. If your relationship ended in divorce, please say why. If it almost ended that way, please explain how you guys got out of it. If you are an expert or something please highlight the important things to avoid or common traits that would lead to a failed relationship in the long run.

Thank you all

PS: do NOT tell me to avoid relationships, work on yourself, or some other advice like that. You would be speaking to the void because unfortunately I have already determined this is something important to me and its not going to change. Please help me understand how to navigate pitfalls to have the most optimal relationship for years to come as much as you can say generally speaking. Thank you all