Breakups can be hard but I would say rather bluntly, It was a good riddance. If she really loved you, she couldn’t fell for any other guy. It is good thing that this happened sooner than after a long torture. Life is not over with one cheating girl, you should move on. Time will heal all wounds, you just need to tell yourself that you didn’t deserve a cheating gf like that. Surely you’ll find someone who will really love you from the core of hear heart. You need to face it with positive attitude and don’t think about getting back to your previous gf.