This happened to me, seriously, no kids involved but I live well and he cannot ever relax again because of what I did. Step one is to get a joint card and get yourself a fab new haircut, manicure, facial and any other preening you fancy.
Step two, get theeself to Boots, pick you fave make-up counter and get them to show you how to do make-up properly on you. Use the same card to buy everything they recommend.
Step three now you are even more gorgeous, you will need new clothes and shoes to enhance your new look.
Step four, get your bestest girly mates (and a babysitter, I'm sure your family will oblige ;) ) go and have some good nights out, don't be afraid of your fave watering holes - if you bump into him he will leave, if this happens give it ten minutes or so and then move you gang to the next pub!
Step five been seen to be having fun and enjoying yourself, it will be hard, but don't let him see you are beaten.
Two and a half years latere and my ex still can't go out for a drink, well anywhere really, or go to any gigs, his brother has met my new guy, all his mates think my OH is fab...... And he's sitting at home with the OW, nowhere to go and nothing to do cos I might well be there...... In the words of REM, 'I'm not one to sit and spend cos living wells the best revenge, baby I am calling you on that' good luck honey!