Dreaming of laughing with your ex is both positive and negative sign as per dream meaning and interpretation. The dream means other people who had neglected, ignored and insulted you in the past will realize your value. It also means people who had left you will return back after learning about your success. Dreams of laughing with your ex and you seem happy in the dream then it is a sign of happiness and peace in life through proper decision. It also means realizing your stupidities and follies and laughing over it.
Dream of laughing with your ex and you wake up terrified or
sad means you will be forced to revisit your past and you will not be happy
doing it. The dream also means others forcing you to do something you are not
sure about.
Dreaming of laughing with your ex and it is in a known place
means you will hear positive news about your ex. It also means you will be
missed by your ex during a crisis or important event in near future. It also
means you might be jealous about this new achievement or relationship
Please note that thinking or talking about ex during daytime
or just before going to sleep and then having the dream has no meaning. The
dream will only have a meaning when it happens naturally without any kind of
daytime influence.