Yes, I am getting old but as you will find out for yourself one day wisdom comes with age. It is not because we gain intelligence, but rather it is because we learn from experience what we should have done. It is our wisdom that hopefully will help others, our children as well as those we 'meet' who are facing similar issues that taught us through "learning some of life's lessons the hard way".
You are to be commended for your continued maturity and your acts of selfless efforts to raise your little girl to reach her full potential through a life that is full of love, from a DADDY who sets a great example!
The advice you have been given through the many posts on this site, if taken, will lead you and Breanna to spending your lives together! Fill your treasure chests with memories that she will spend countless hours going through one by one, over the years with you as well as sharing them with her children and grandchildren someday!
Remember this, and never let it slip your mind for a second. NO WOMAN/GIRLFRIEND who does not fully support your efforts and who is not 100% beneficial to your life (which goes without saying, is also your daughter's life) is worth a second of your time. Do not let anyone, or any urge, etc., cause you to lose your focus.
My Nana told me, when I was a little girl, something that I wish I had lived by prior to my mid 30's (would have saved me a lot of heartache & not to mention I would have saved a lot of money too). She told me: "whenever you find someone to spend your life with (according to her--it could be one day, or forever) having that person in your life should improve your life. Things should be better, and never worse. Spending time with a person who does not enhance you, and your life,might keep you meeting "Mr./Mrs. RIGHT". The price you will pay is very high for everyone with whom you are involved. (At the time, she was speaking of my parents and siblings, and of course herself and my Papa. However, today that holds true with my children--first and foremost!)
I know it is hard for your present girlfriend to overlook your past--a past that is forever a part of your life. But it can be done, and the right person will not only be able to do it, that person will insist on doing whatever it is that is right for YOU and BREANNA!!!
Keep us posted, and keep moving on the course you have already directed as the right path for you two!