Great Morning! I can understand the present condition of your mind.
Think differently, it is good that he cheated early not late. Suppose after few months, years or after marriage he he would have been cheated you, what you would be done? You are very lucky that you came to know early with whom you wasted you precious moments of your life? Now focus on your Near and Dear family members who always love you unconditionally. Spend good time with them. Start doing your hobbies, physical fitness, meditation. Start New era of your golden life with fullest thrust. It is good to stay away from cheaters always. Analyse people!
Next Steps
To get rid off old bitter memories go for Clinical Hypnotherapy....