I... wow. That you think it's OK to leave a perfectly salvageable marriage (My wife and I get along great. I love her. We have fun together.) when you have (or are primary guardian of) children this attached to you is... Ask yourself, are you a man? Will you accept the responsibilities that have been placed upon you?

(I'm not completely unsympathetic, but I think you need to think harder about the full consequences of your actions on those around you.)