My wife is a child of divorce, although her parents divorced when she was 20 years old in the middle of college. She hates them for living a lie and the way they tore her life apart when she was trying to get a college education. She never was able to finish school because of the scars they left behind during those years of her life. She wishes they had divorced when she was young. She tells me so many times that it hurts her more to know that they lived a lie until she was grown up than it does to know that they weern't in love. I think kids can handle it better than young adults can handle it.
I also have a male friend in his mid-20's whose parents got a divorce just two years ago and it has really messed him up.
There is no doubt in my mind that smaller children can recover from something like this faster than adults who really aren't adults yet.
I would never advise a divorce but in your case it seems like you married a habitual liar and cheater who simply cannot stay a good person for very long. Some people are just bad people. I wish you the best of luck and hope that none of this has offended you........