Not unless you are both willing to learn how to communicate and mature. It would be best if you gave each other head space to figure out who and what you are in yourselves and what you want out of life. This also makes one mature on a more rapid basis. Yes, it's possible you could get back together again, but make the separation worth it and each of you has to learn to give and communicate if you want any relationship to work well.
If they have a girlfriend they do not want you back.
yes.
I am a girl and i would NEVER get back with my ex.
Yes its possible
There are plenty of possible answers. One of mine favourite is: go to hell.
Leave her alone.
no
let him go
no she doesent
If you are indeed keen on getting your ex girlfriend back, even if her ex boyfriend want her back, what you can do to make sure that he will choose you is make her see your best foot forward. Show her how better you are over her ex, how happy you can become if she decided to come back to you and how things will be better now.
because this preson still has feelings for his ex-girlfriend
If you really want your ex girlfriend back, I would just talk her about your true feelings. It really depends on how long you have been apart.