Lost my sense of trust

I've been married for about 3 years. I married older in life in an effort to "not make the mistakes" I noticed most of my friends and family were making. I have recently discovered, my husband has had and is having affairs that involve fat, unattractive women for sex. Once he got caught, he admitted to the affair and blamed me for his actions. Our sex life is average at best. He works long hours and is tired most of the time which affects his interest level. However, he meets his "affairs" while at work when he is awake and I'm sure full of energy. Well, need I say, I have lost my sense of trust in him. Not only am I angry over the fact that he doesn't take responsibility (blames others), but he forgot that maybe I'm interested in good sex too! He thinks he has the upper hand in our marriage but he has low self esteem like the "unpaid whores" he runs around with. I have verified his affairs with confirmed txt messages and emails. He has recently broken up with one affair only to start another with an obese, unattractive female. Go figure. I'm seeking professional help for my own "head" and wonder if I could ever trust this man again. I welcome your comments.