When Does Life Move On?

It's been difficult. Difficult to live with the pain and difficult to live with something I do not understand and cannot comprehend. People all over telling me that this is just how it is. That all men are the same, all cheaters, but if their worth keeping you'll look past it and move on. How is it okay for a man to betray a woman just because they are a man? How is it that the woman is expected to forgive and move on! I cannot forgive such betrayal. Why? Because, the thought that I never meant enough to him for him to hold back or for him to just be honest with me is more painful then anything I've experienced. 

We don't hurt the people we love. We charish them, take care of them, and spend our lives being the best people we know how to be. His betrayal showed me  the truth of his love and no matter what he says none of it will mean anything because his actions were clearer then his words. His actions showed the truth of the man he is. 17 years of affairs and I'm supposed to believe they are all over? That it won't happen again? I would be the same idiot I've always been if I were to just close my eyes again.