Mixed Emotions

I feel as if I messed up and I'm doing everything wrong and I feel I shouldn't be with him but I really like him, but I still really like my ex, now I'm lost in this circle of feelings and I don't know what to do anymore. I'm so lost in these mixed emotions, I feel that I can't do anything to help myself. I feel as if my life is all messed up because of one mistake and I have no way to fix it. Is there anyway that I can fix it or shall I just wait and see what comes my way while I'm lost in these mixed emotions?