If you aren't happy with your life or how you look, try to change it in a positive and healthy way. You can live life the way you want. Other people may not agree but it's your life and you can live it any way you want.
Majority of cheaters have cheated more than once, and after being caught the majority will cheat again. Don't let yourself become a statistic. Why give him a second chance to betray you? He's only going to to try harder not to get caught.