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Sadly you can not make someone stay with you if they are ready to spread their wings and that is what it sounds like it is with her she has been in serious relationship at a young age and hasn't really given herself time to have fun and just enjoy life and I think that is why she doesn't want a serious relationship because she is young and doesn't feel that she could do that being with you. She would have to answer to you for whatever she wants to do. She pretty much wants to sow her oats what you are going to have to do if love her enough to let her go and if things were meant to be she will come back but if they weren't then maybe it will be time for you to find closure in the relationship and start to get out dating again but only when you are ready. You have asked her several times to give it another chance and each time the answer was no, I think her mind is made up for now.
Hopefully she will get in the dating scene and see that things aren't as fun as she thought they would be. Give her time to have her fun maybe a couple of months and then go to her again and see if she hasn't changed her mind and if she still wants to be single and have fun then you are going to have to move on and start healing from this , start out slowly just go out with friend to movies or dinner or do things you like to do hobbies, interests, you have to keep your mind off of her and if you stay by yourself then all you will do is think about her constantly and that isn't a good thing. My question to you is wouldn't you rather have her in your life as friend than to not have her in your life at all but if it will hurt you to see her and not be with her then that is your decision to make and you know how much you can handle and how much you can not.
Just give her a couple months and talk to her again and see if she hasn't changed her mind and then start the healing process if she hasn't change her mind and doesn't want to be in a relationship with you.
I understand it's going to be difficult but you don't want to keep pressuring her into staying with you or being more than she wants to be that will only make her want to be without you more that is why you have to have patience and give her the time she wants what would be harder a few months or a lifetime without her, if she sees you are willing to give her time and be patient she may see that you may be the one for her and may come back but if she feel you do not respect her enough to give her the time she needed and she may never come back.
She may have gotten scared and just panicked if she loves you now she will love you when you are apart I think she will come around when she realizes that she will no longer be around you or see you on a regular basis she may miss you more than she thought she would but you won't know until you give it time. Maybe talk to her sister and ask her if she can talk to her and see what the true reason is for not wanting to be in a relationship maybe she can shed some light on the situation but I would still give her time. The old saying "Absences make the heart grow fonder."