Hi I wanted to start by introducing myself,
My name is fanco and I'm going through a heart break with my ex girlfriend that broke up with me 3 days ago. We were only together for 4 months going on 5

How everything started was that she told me she needed time to think and let her focus on what she really wants.. she was with her ex for about 4 years and he treated her like.. he took her verginity and when they got into a argument once he told her "thats why i took your virginity you ing slut"... they broke up and about 6 mounths later we met... like I said I was with her 4 months going on 5 and I treated her like a queen.. always gave her my all and she saw that her family loves me and tells her you don't know what you have in front of you... its been about 3 weeks that her ex trying to get her back by telling her that his dad has cancer and she is all he has.. he told her that he has changed and that he can't live without her and I think she fell for her lies... we broke up for about a week because she told me she was confused about her feelings and did not want to hurt me.. a week later she txted me saying she wants to start all over and take it slow. She then told me to go over and told me that she thought about things and I'm the one that she wants and she wanted to make me happy.. everything was going good for about two weeks.. telling me she can't wait till we move in and till we get married... two days later she tells me that she's not happy and needs space because she can't make me happy if she's not happy with herself... she said she's moving on so that I can be happy because I deserve it... I know she's talking to her ex but I know she won't get back with him, her family hates him because he hit her and her dad told her if she gets back with him he's going to kick her out... I talked to her older brother and he told me to act like I don't care and to not contact her and not to worry about her ex because nothing is going to happen there... he told me shell call u.. shell realize what she lost

I really love this girl and I don't know what to do
What can I do to get her back?
Or should I just move on?

Act like you don't care? Bad advice when you do care, and it's OK to let her know how much you care as long as you end it at that, and wait to see if she contacts you again in all her confusion.
Some people equate violence with love. 'He must really love me if he is so tormented with anger and jealousy etc.' It's warped thinking but a lot of people have it. She's trying to stop feeling that way, I think. Give her the space and no contact and wait. If she moves on... then you weren't for her deep down, and she liked you for all your niceness at a time when she wasn't treated well, but you just aren't for her. Nothing wrong with you, but you do have to accept it. Unless she wants you back, and decides that she appreciates you and that's enough love for her. Love often evolves that way.