Out of the many, a few relationships reach a stage where it becomes difficult to continue. Any amount of efforts put in to set things straight do not help. It is like trying to rekindle a fire using completely burnt wood, (wet wood might be difficult to set on fire but after some smoke one lucky spark does succeed.) In such cases, however difficult and painful it might be, the best thing to do is let go. Sometimes, it becomes essential to give more importance to yourself than to the relationship. The new journey might, along the way, bring you to yet another relationship. You must be strong enough to give yourself another chance and not let the past relationship affect the new one.
*After every effort you put in your relationship, you deserve happiness. If not in that relationship then some other*