Getting the best of both worlds living in our house with me paying bills and doing whatever she wants.
This is cake-eating. Common practice for WAS. Getting their "fix" from PA/EA/OP, and still having normal life "items" taken care of by LBS. Horrible spot to be in as a LBS, and makes it tough for you. You want to take care of things for WAS in hopes that it will bring the WAS back around to you. Best thing to do is to cut all finances you are paying for that support her affair. If she has a cell phone you pay for, shut it off, make her make her car payment, insurance payment, fuel, etc.... You will ensure that food is paid for so your son can and you can eat, power is on, etc.....