The real reason relationships fail is because people aren't willing to grow. That's why i broke up with my ex. She had what's called an avoidant attachment style where a person avoids getting too close to people. They're afraid of abandonment so they avoid you. In my case, my ex said she was "too busy" to talk to me and chose to talk to her friends instead. Some women have the same problem, but they still have successful relationships. They tell their boyfriends "i need space and time to build trust.." My ex couldn't honestly tell me the truth so there was no way i could help her.