Arsh, one other thing - when my husband asked for an immediate divorce in January and I asked him why it had to be right away he said it's because he "doesn't want me to have any hope." Then he whisked his girlfriend away to Dubai presumably to celebrate. Such an urgency to divorce right away could be a sign that your husband has someone else. Eventually you'll likely find out if it's anything serious. I remember you saying you and your husband have been together for a long time. Your husband might be like mine, believing he missed out on the dating scene when he was younger and wanting to have fun. It's not by chance these guys become this way after we have kids. We're too busy and exhausted tending to the children to focus on our husband's needs and we can't give them the fun carefree life that a single younger woman could offer. Suddenly they're faced with a dilemma. Why should I stay in his oppressive burdensome marriage with a boring tired nagging wife when I can have this sparkling young, single, gorgeous girl who has all the time in the world to make herself look good and shower me with attention? The temptation is so great to break free. It seems many MLC issues revolve around this dilemma as well. The miserable life you have now verses the perfect fantasy life you deserve. And yes, based on what I've observed, there appear to be an unlimited supply of women who could care less if a man is married with young kids. In fact it seems to be very common. And that makes it even more tempting for men like your husband - they can find another woman and they don't need to commit. They can date, sleep with other woman, do whatever they want because such women make it easy. In American / Western culture you can have a one-night stand, casually sleep together, or date for a long time without getting married and this is all fine.
In any case I've been thinking about your situation and I just don't think it's anything that you've done wrong and I doubt anything will stop your husband until he gets what he wants and discovers it's not so great. Then he should be back. You should feel confident about that if you suspect an affair. Even my husband was living his fantasy life several times now with his girlfriends and the relationships didn't work out - nothing can be that perfect forever. Once they figure that out then suddenly you and your daughters and a warm, cozy home will start to look much better again.