To dream about your ex-boyfriend/girlfriend or ex-husband/wife, that you and your ex are kissing/fighting or that you and your ex got back together again suggests that something or someone in your current life is bringing out similar feelings you felt during that relationship with your ex. The dream may be a way of alerting you to similar behavioral patterns in your current relationship. What you learn from that previous relationship may need to be applied to the present one so that you do no repeat the same mistakes. Alternatively, you may be reflecting on the positive experiences and good times that you shared with your past love. Dreams of getting back together with your ex or of your ex wanting to get back together with you may not necessarily be a reflection of reality. This dream may be triggered by some major change in your current relationship and how far you have come from those past relationships.
The memories of your ex are still close in time to you. .Four months is not a long time to be separated from someone so you may have some "unfinished issues" regarding him. Can you think what that might be? You sound like you are unable to set him free. You may still retain some strong feelings, good or bad, about him in seep ...feelings cause dreams. Examine what you really feel about this ex... and then act on what needs to be finished so you can find some peace of mind and move on to dating someone new. I wish you well.
Your mind recognized that you were in a relationship recently and you will continue to dream about your ex for at least up to a year....those memories will fad away.
Nothing, do you think about him constantly? If so then you will dream about him.