Barbara, based on what your husband said, and how you feel, you're doing the right thing. It's nice that he's more concerned with making you look bad and when he's going to start dating, when he SHOULD be thinking about his sons. He was probably thinking about dating other women all along, but just didn't have the guts to talk about it. He's lucky you actually had the courage to do something about your situation. It seems like you'll have to have courage enough for everyone. I have a feeling you can do it.
And you've already been making decisions for your sons, so that won't change. I think this divorce will make things easier after awhile because you won't have to deal with the facade that was your marriage. You can focus on what is important---your sons and your relationship with them. Good luck......