Statistics tell us more than 50% of marriages end in divorce, and 7 years tends to be the magic number for the average length of a couple making it before divorcing. Obviously the first year is the honeymoon phase. At about 4 years, tensions tend to arise and by year 7, couples are either in a fight or flee mode, where they will find a way to deal with the tensions and move their relationship forward or decide that a dissolution is where they are heading.
Multiple studies clearly indicate communication is crucial and misunderstanding left unattended grows into resentment and contempt. A couple really needs to decide whether they are going to work through their difficulties and make the relationship work. You have to be willing to spend the time to work at your relationship. Kindness, good communication and respect for one another are vital.