I am a Scorpio male trying to rekindle a pisces heart?

I dated a Pisces female, fell in love within a few weeks, and dated for 4 months and towards the end she started acting funny, turns out her ex had came back into the picture. confused and being stupid she ran back to him. Not even 2 months later they are broken up. I still love her and i don't know how to get her back into my life.