Almost all of us have dreamt of past relationships, such as an ex boyfriend/girlfriend or ex spouse.  People frequently are unnerved by the experience and are concerned that they are having feelings toward that person again or vice versa.  

Dreams involving past relationships are actually symbolic of the dreamer reverting to old ways of thinking or going back to old habits or things of the past.  These dreams are attempting to get our attention so we will stay on the road to our destiny and not get off track.  They are alerting us so we will recognize old patterns arising.  

An exception to the rule is when dreaming of someone who was your first love in life.  In our dreams, usually our first love will be representative of God.  These dreams are either beckoning us to return to God or they are revealing that we are.