Plain and simple, it's because this is what's on your mind. There isn't a real psychological thing, in a way. The main reason that you're dreaming about your ex and his new girlfriend is because it's what's bothering you most right now. give it a few weeks and you'll get over it.
Your subconscience is trying to tell you something. Your x lover has a new flame, she is happy, she makes another man happy. You are not involved with her new life, you are only watching.
Most people would tell you to move on (and I'm sure they have already told you) You have also been told "the hardest part is moving on", I'm sure. "Take your time. But for your own health, you need to let her go." There is a problem here, if you have been trying to move on, but still see her in your dreams, then you are still feeling something that needs to be released.
Let her know how you feel!
TRY IT! There is nothing more to loose, you have already lost her, now is the time to take a swing at winning her back! ***But keep in mind, it is up to her where she lends her heart. Ask for her ear first, if she listens and you speak truthfully, you may win more than just her ear...
I think that you still have feelings for your ex boyfriend. You may not have accepted the breakup and can't help but feel something in your heart for him. Since you have a new boyfriend already, you can't really help it. Telling your boyfriend may result in break-up, so I don't recommend it. I'm only 12, so I may not have a lot of experience. You should talk to a girlfriend or another close relative for more help! :)
get over it and move on
because you miss her a LOT !
Dreams often reflect our subconscious thoughts and feelings. Your dreams about your boyfriend's ex girlfriend could be a manifestation of your insecurities or concerns about your relationship. It might be helpful to openly communicate with your boyfriend about these feelings to gain clarity and reassurance.
The significance of dreaming about your ex-girlfriend basically means that you are still thinking of her.
She probably did it to make the ex- boyfriend jealous.
You should be confronting your ex and telling him you do not like his girlfriend asking your children about your new boyfriend and if it keeps up he will only be able to see his children at your home or without his ex girlfriend.
you should find a new bf
A girl should never fight with her ex-boyfriend's new girlfriend. The girl should move on and let her ex and his new partner do the same since fighting will not solve anything.
It may mean you still have feelings for him and so are worried about a situation in which it would be hard to get back together with him. It is okay that you still have feelings for him but also move on to.
find a new boyfriend or girlfriend to stop you thinking about them ( your ex )
You do absolutely nothing about your ex boyfriend considering he has a new girlfriend. If he loved you he would break up with his girlfriend and since he has not then he wants to be with her and you need to accept that. Just because you have broken up with your boyfriend it doesn't mean you can just step back into your ex boyfriend's life.
Simple Answer: You don't.