Relationship help

I wasn't sure where to ask this question or where to seek advice, but I have been in a relationship and we had been dating for a little over a year and then we got engaged. We were doing fine and then there was a point in time that I guess she felt like things weren't working out so we called off the wedding but we stayed together because we were going to try and work things out. Now we are no longer together. She says that there are still days that she wants to be together but something inside her keeps telling her no and that things haven't really changed and she doesn't want to get into a marriage with these kinds of problems. She wants to start off all happy and then if there are problems later we will work on them then. Right now we aren't really seeing each other or talking very much. I guess I just want to know if I should maybe try and hold on or keep having hope that maybe things will work out or should I just completely let go. I want to believe that maybe we will be able to get back together because she is who I still want to marry and spend the rest of my life with but she doesn't know what she wants. I just need some advice.

let her decide what she wants first otherwise its a waste of time and energy