I'm sorry to hear your W has been doing this...but I'm sure I wasn't the only one on this board who was afraid this was the case. BUT, to reiterate what you've heard before...the things you are doing NOW are getting her attention.
Also, having a separation doesn't necessarily mean that you are allowed to see other people either....that's something the two of you either agree/disagree to do. At least that's how I've learned that to be...someone let me know if I have the wrong take on that. It's been my observation though that there are many people who separate to get space in their marriage, but don't date or seek out other people.
KEBall...keep doing what you have been doing. Try your best to maintain that Man-o-Steel image on the weekends too...do what it takes to keep occupied. And as csw pointed out...be thankful for what you do have, your children are a blessing and a gift remember that when you do spend time with them. Try not to get wrapped up in envy of other people (although I know that's difficult).