Our actions have consequences, and no matter what you want, its up to him to forgive, even if he doesn't forget. That's the problem, people just don't forget getting cheated on that easily, or the anger they feel from it. That's crazy, so give him space, so he can deal with his feelings, and I'm sure without your begging and pleading (which hardly ever works) he will decide if your worth a second chance, or not.
Some say you have to fight for love, but in this situation, all the fighting in the world won't change his mind, if that's not what he wants.
We won't even get into the trust issue, if he does take you back, since it hasn't happened.