We love each other but we can't be together... what should I do?

Its turture I love my daughters mother and she still loves me too. We have a 5 year relationship together and we share a 2 year old together. Me and her have had a very turbulant relationship... but the fact still remains that we still love each other dispite everything. However.... we have come to the conclusion that since we have tried time and time again to make it work and it never does that we could never be. She misses me and wants my company.... I miss her and want her company, but knowing the reality that we still love each other but can never be is turture for me. Its like a movie where the man and woman love each other so much that they can never be... she still wants to see me and spends time with me, but every time I see her my heart gets connected and its turture. What do I do? I spend all my time with my daughter but its only time that me and my baby share together not my EX. I can't stand being around her without wanting more, and I can't be her friend because it hurts to much... so what do I do?