Divorce 
To dream that you are getting a divorce suggests that you should prioritize your goals and other aspects of your life. This dream could also represent your anxiety of being alone. You could also be dissatisfied with your current partner. Dreams of divorce represent the waking world and the trouble it brings. You may feel that you haven't made the right decision and would like to separate, or 'divorce' from it.
Ex
To dream about your ex-boyfriend/girlfriend or that you and your ex got back together indicates that people currently in your life are reminding you of those same feelings. This dream could be warning you that you are falling into a repeated pattern in relationships. You should consider the harsh lessons you may have learned so you don't repeat them. Sometimes, however, past encounters can be satisfying episodes in your life. This dream may also indicate things you have X'ed out within yourself.
To dream about your lover's ex could be that you are trying to live up to their standards. This dream is warning you not to do the same thing you did in a previous relationship.
To dream that you are kissing your ex suggests that there are certain attributes about your ex that you enjoyed. This dream isn't indicating necessarily that you wish to visit the relationship again, but that you should think about what your ex's better qualities or attributes. These are the attributes you are finally coming to acknowledge within yourself.
To dream that your ex has died suggests that the emotions you had for your ex are finally over. You have moved on and he or she is now relegated to your past.
Break Up
To dream about breaking up with your partner suggests that there is an aspect in your life that requires you release it, regardless of the difficulty this aspect will bring.
To dream that you didn't break up with your significant other indicates that you must come to grips with the reality of the situation. Your subconscious may have yet to understand that the relationship has come to an end.
Adultery
To dream that you've committed adultery means that you could have sexual desires or be sabotaging yourself. This likely comes from the root of your subconscious mind. You could be drawn into an issue that is not within your best interest such as a legal situation.
To dream that your mate or spouse has cheated means that you have concerns about abandonment. You may sense neglect within your own relationship. You could also feel as though you're not living up to what others want from others.
To dream that you are cheating with your friend's friend means that you're probably feeling forsaken by your own self.
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