What is stopping us to communicate?

Why some relations become complicated without any reason? Why we don’t talk and solve problem when we can? We lost people by our mere ignorance and taking as granted attitude. But sometime I really think that we should just talk. Talking solve many problems…and remove the misunderstandings…I am kind of a person who gets hyper in no less time and be serene the very next moment. It really really hurts when your friends don’t understand you. Life has become more complicated then it use to be. It was fun when we were younger. I have lost touch with many of my close friends in last four year... For some I don’t exists and for me some. What is stopping us to communicate?