Get back in there and keep an eye on your daughters. Show them what true strength is by being there for them. As far as the wife goes, stay dark. Your marriage can survive infidelity, but it will be very difficult and believe me, I understand all about staying in it for the children. Right now, your wife is not thinking clearly and your girls need someone there who can.
When you get back in the home, be the best darn daddy ever. Act as if you were never gone. Help with homework, chores, whatever. If wifey asks why you returned, tell her you want to be near the kids. Don't dare start asking "Where have you been?" questions of the wife. Above all, hang in there. Keep coming back to this place for help. Don't give up and stay focussed. Take little steps. Your first goal is to get back in the house. Tell your wife you are coming home and will stay in the spare bedroom (or elsewhere). Tell her you still have hope.
It will be difficult, but don't get down on yourself or beat yourself up. This is a great time of year for that sort of thing. You will soon find that you are stronger than you know.
