Can I save my love? Will I succeed? Will she come back to me?

Your GF is horse and you are monkey. To be honest, these two signs are compatible according to Chinese zodiac. However, this doesn't mean that they can be together forever. There are many other factors. A third-party in your relationship should be blamed but you and your GF should rethink about your relationship. If you both got along with each other, how could the third-party get a chance to ruin your relationship?

YC, if she doesn't want to be together with you, you should let her go. There is no need to waste your time one someone who doesn't love you anymore, though you still love her.