Most Helpful Girl
I know how you feel and the that type of hurt in indescribable. Relish in the fact that you found out before you got married because you would have been miserable. I went through the same thing w/my ex of nearly a year. I thought he was the one and we often talked about marriage, I came out w/a totally broken heart. I fell in love w/him before finding out that he was not marriage material and very rough around the edges, at our age more then likely a person will not improve. It has been a couple months post break up and other then trying to get my stuff I haven't contacted him nor have I seen him. I deleted everything off social media. The best way to move on is improving yourself. When you miss her remember all the negatives and why you would never be happy w/her. This a lesson for us, not to fall too quickly.
Most Helpful Guy
Just realize she was almost certainly cheating on you so to Hell with her