You can get her back, it's actually pretty simple. If you: profess your undying love, buy her a ring, tell her she's the best thing that ever happened to you, then tell her you can't live without her, then hop on one leg, spin around to the left, then spin to the right, then Do a headstand while screaming " I love you, I love uou, I love you." If that doesn't work, do it in reverse order, while screaming louder, professing your love harder and being more sincere...
If none of that works... Stand up on your own two feet and act like a man. You have an unhealthy relationship with a woman who don't give two ****s about you. The harder you try, the less she cares, life moves on! You need to move on. Cold turkey, get rid of everything that reminds you of that chick, delete her number and delete every text she's ever sent you...