My outside advice is that all signs are that he won't change, and that by not dealing with what is happening, living on hope, you are putting off inevitable problems. To me, and probably others here, it is wiser to look at your options re legal proceedings.
I've an anecdote to tell of a friend of mine's story. She and he were madly romantically in love, got married, and she became pregnant sometime later. He had an affair with his secretary, who "needed him". She cautiously forgave him, they tried to work things out, and she became pregnant again, building their family. He had an affair again, another secretary, and that time, she divorced him. This was all a long time ago. The children are now in their forties; they still have relationships with their father, but since the divorce, lived a calmer home life and successful lives, far as I know, as adults. The mother, my friend, married again with no big problems in that marriage.
My advice then, is think ahead, with your head.