When emotional intimacy is present in a marriage, you feel safe to share all your thoughts and feelings. Without it, your marriage functions only at surface level, where you are more like roommates than husband and wife. Being truly emotionally intimate requires more than a one-and-done confession. It requires continual practice and dedication.
Busy schedules, stress, or sin struggles can all interfere with your ability to share deeply and consistently with one another. It takes significant time to build and maintain the foundation of trust that emotional intimacy and vulnerability requires. So, when you listen to your spouse's feelings and confessions, seek to bear their burdens (Gal. 6:2) and forgive their sin against you. In doing so, you will find the oneness that God intends for your relationship.