Why is a good relationship hard to keep?

Relationships, oh boy, everyones had their share of getting hurt by now, but don't you wonder why? Our parents tell us not to get into that stuff and it won't happen, but in my opinion you kinda have to get out there and experience it to get the full affect. My opinion on why relationships don't normally last very long is simple, communication. Talking is key. Im not exactly an expert on relationships but from my own experiences and watching others around me, its not hard to pick up on. Misunderstandings are usually a key component of heartbreaks and arguments. "He said that about you." "She said this." Stop listening to what other people say! Why don't you just go up to the person and straight up ask them if its true, because in most cases its just a rumor anyways. But if it is true, and it doesn't work out, well then move on, its not like you were going to get married or anything. And besides were only in high school, dating is just for fun right? There are also a lot of relationships that don't have to do with opposite genders at all. Relationships can also be within friends and different clicks. The main thing is that you talk about it. Don't scream or yell at them. Stay calm and just talk about it, figure it out, because talking about it and getting a long is much better than not talking and losing a friend.