Can You Help Me To Move On?

I am a teenage girl that is afraid to be with another guy. My last two relationships were the longest ones that I have ever been in, but they both ended badly. The first one was with an older guy who started emotionally abusing me and trying everything possible to control every aspect of my life. After I finally got away I met a new guy who promise me love and devotion. It was, in a way, a fairytale relationship! He was sweet, kind and loving. But when I refused to sleep with him things went downhill and I caught him in the act having with another female. Now I don't know what to do and its killing me. I want to move on but I am scared that it's just going to be another failed relationship. Can you help me?