How can I get the mother of my child and fix our relationship?

Ok I am going to start off by saying that I messed up and I regret everything on my behalf of our relationship and I want to fix things. I was with my daughters mother for 5 1/2 years. We have a 3 year old together and we have had an on an off relationship after the baby was born. Long story short I couldn't handle the pressure she would put on me during our arguments and I would get fed up and leave. I would send money of support each week and I would see my daughter every week every time we would break up. We never cheated on each other just to clear the air. In march 2011 we broke up and since then I have been hurting big time. However in june that year until october she called me and wanted me to spend to see the baby at her house... When i was seeing my daughter on my terms in my house. So because i still love her I did exactly that and again i was seeing my daughters mother everyday once again. However i found out that in May she opened up a profile for a dating site. That started bothering me because I wanted to work on us... But she would always say that she wished our relationship could have worked but she got tired of the make ups and break ups. So after halloween I went to her house and confessed that I will always love her but that I understand that I can't force myself on her. She started crying also and we both confessed our love. However right our emotional confession she started dating another guy... But that

relationship only lasted 2 months. So I was living on my own and in February of 2012 my exes family asked me if I wanted to come back home I said yes so since February until now I have been living back in the house. I see my daughters mother everyday again and my daughter. I have been doing a lot of soul searching and I realize that "my daughters mother really really Loved me" but I messed it up every time I would walk out. I have noticed that things aren't the same between use. She resents me and is very sarcastic towards me a lot and short and punchy. But then there are times when she is kind and nice like before... And sometimes we flirt.... But only sometimes! She knows that I still love her... But she says she has given me to many chances. And so have found out that she is still on dating sites but have yet been on any dates... I know because we always are at home on the weekends and I drive her to work so I know... But she still has he profiles up. She has more then one profile on more then one sight... She must be really hurt and lonely. I feel like a big piece of "ISH" because I hurt he for not sticking around! I wad reading our old emails and text's and what seems to be repeating in the message is the " you need to stay, you promised you would not leave, and that better not be a runner." I'm tired of running and I'm tired of hurting her.... I know it takes 2 to tango but I feel I could have handled things differently. Her mother,father,sister and co- workers want us together but she is fed up... And I don't blame her. I could live on my own because have family of my own in the same city... But she has yet kicked me out! Also, she did mention to me that I was her best she had and that I'm a good person! But mean if she knows these things why won't she give me another chance? I'm trying to change and I'm tired of running! I am really re-evaluating our relationship and how I handle pressure so that do make the same mistake ever again. I am a fool and I'm hurting... I guess I deserve it. But is there anyway for that this relationship could be reconciled and fixed. I am trying to show her that I'm not leaving and that Im trying to change! Is it ever too late? I see her on her iPad and know that she is on the dating site and I feel at a lose. Other then working on me and trying to change and being good to her... What can be done? How can I get the mother of my child back. She is black I am puerto rican and our daughter is beautiful and it's killing me because we are so close but yet so far apart. I miss her, I love her and my family! Want to fix our relationship... What can be done? Ladies thank you and sorry for writing a novel! Thanks.