Just knowing the problem and letting it pass would not help you to save your relationship from ending. You have to admit that your relationship is breaking up and find a way fix it quickly.
One of the ways to save your relationship with your partner is to determine what the problem is and work on it to resolve the issue. One thing you must never do is take advice from people about your relationship. Others even your closest friend does not know your partner like you do and their advice may not suit you.
Also their opinion are often biased. This can affect your relationship in an adverse way rather than helping it. Another thing that you should not do to save your relationship is force your partner in any way. If he or she needs some time, them give it to them.
The most important thing to prevent a relationship breakup is to have patience. Even if you are having regular fights, never fight publicly. Always keep your arguments private. When you fight publicly it makes both of you embarrassed and small. This will surely effect your relationship in a negative way.
Also never use past confessions or fights as a tool to win fights. If you want to save your relationship you have to be fair in your fights. One thing that you can do is, if the problem has gone too bad and even talking is not helping because there is still some gap between you too is to consult a counselor. Since the counselor does not know you personally, he/she will give unbiased advice and this would help in you to save your relationship.
However, only going to a counselor would not save your relationship. You have to be honest and have to work hard to make your relationship work. Again the most important thing is to have patience.