Cheating husband

My husband and I have been married for just over a year. He just told me tonight that he cheated on me. Twice before we were married and once after. Before we were marrie he told me that he had cheated on a previous girlfriend and that it was the worst decision he had ever made. I believed him. Recently he told me he had cheated on a second girlfriend as well, which made me nervous but I still trusted him. He is a good guy and he worked really hard in our relationship. We have a lot of fun together and get along great. I'm a smart independent woman and have always prided myself on my intuition but I really didn't see this coming. I don't even know why I'm posting this, I just don't want to tell any of my friends or family yet. I feel embarrassed and stupid and angry. But mostly just sad. I know that I can forgive him but I will not stay married to someone I can't trust. I feel ridiculous to be planning to divorce my husband after just a year of marriage.