Does it creep you out when you dream of your ex-partner? Especially when you are with a new partner? Relax. Dreaming of an old boyfriend or girlfriend is common. A former romantic partner who is lost/ separated/ parted ways, is a loss. You may have nursed some regrets over the breakup. You might have wondered if your relationship could have been saved if either one of you said or did things differently. You may have salvaged the best memories or the worst ones. You think of your old partner because of nostalgia. The same night, your brain may be inclined to create a dream of your ex, because of nostalgia.
If in reality you are facing a situation whereby you regret your choice of current partner, then it is natural for you to nurture nostalgia and dream of your ex.