I cheated on my BF of 1 year...should I tell him?

What you did is not acceptable, but you became a big person and realized the mistake that you did. Now, my suggestion to you is that you do not tell him. Yeah, sounds callous. But you need to know what the consequences will be if you tell him. First you will brake his heart, and then he is going to feel betrayed, and on top of that he will brake up with. What you need to do is to forgive yourself for what you did, learn from it, and move on. Then you will not be having those resentment feelings about yourself. Because i know for certain, that if my girlfriend told me that she cheated on me. I would break up with her and that will be the end of it! Of course I wouldn't appreciate it if she cheated on me and did not tell me. But, what ever I don't know, won't hurt me. Think about that.