I disagree with Carolyn & Christina,
Talk to your mother and sisters and/or best friends until you have it all talked out, and then go have some fun. Do something exciting like go to a bar & grill, with a girlfriend of course, and see who else is out there. Someone might want your cellphone number or give you his, but whatever you do, be choosy, there are plenty of other fish in the sea.
I'm going to get in big time trouble probably for saying so but most people in Psychiatric Therapy will suggest a Psychiatrist, most people that would like to break it off with their own flame will tell you to think, like, good riddence to your finace', most people seeing a Psychologist will advise you to see one and let him/her help you get your thinking straightened out, while mom or dad will give you what you need better, or just jumping back in socially might do the trick, or just having a good cry for a few days will lighten the load considerably, but your finance' made you doubt yourself only to make it easier for himself to brake it off, most probably, and while you were doubting yourself, he said, "That's the reason why" to kind of let it reach home in you. He maybe just had cold feet, or thought he wasn't really ready, or maybe even found someone else, and had to ditch you. Whatever the case, and whatever the reason, it doesn't take much time usually to get over something like this if your just honest with yourself and say that you just maybe didn't truly click or he wasn't truly ready, or maybe you yourself really weren't sure. Don't let his remarks that you have more down time than up throw you. Either he's a idiot to put it all on you and not tell you the real reasons or else your being an idiot for taking that kind of doubt inducing crap from the cad.
Go turn on TV or Stereo and call a friend or call mom, and then go to bed. Start a new day tomorrow.
Love,
Mike Jeffers