To top that off, she wants me to leave.
Yeah, right...let me get this straight. You are a stay at home dad, she's had 17 affairs vs. your 1, 10 years ago. You've got kids at home that you care and tend too while she's out galavanting around town entertaining numerous men and SHE EXPECTS YOU TO MOVE OUT.
First things first. Welcome to MB. Your marriage is always savable as long as one of you remains fighting to save it. Your wife needs serious counseling and has significant deep seeded character issues. Can it be saved...it is impossible for us to know at this point.
If she is in an active affair currently and is pressing separation it is unlikely counseling will prove anything more than divorce counseling. It will likely end up her trying to convince the therapist about how doomed your relationship is so the counselor will advise you two to both give up. She'll be able to then put on appearances that "she tried" and hope she can win over the therapist into believing HER long list of rationalizations and justifications.
Next...no matter what happens you must protect you and the kids financial and emotional survival on the backside. YOU DO NOT MOVE OUT. Do not give up the marital bed nor the master bedroom. No matter what she says or does you stay put. She's cheating, she's a big girl WITH RESOURCES...she leaves.
You will not get custody of your kids back if you leave that house...you'll end up fighting for some joint custody at best. Even as a stay at home father you are going to have to fight your butt off to get full custody. Even if the law in your state reads "no bias" between men and women...that is not how it works in the courtroom. You must start journaling everything that is going on, buying a voice activated digital recorder from radio shack and documenting conversations...you might even hide the recorder in her car to capture her cell phone calls therein. Get a keylogger on the computer and review her cell phone bills if you can. You also want to consider a hidden video camera in the home to document things. If this ever goes to court you will be portrayed as a lazy jobless man and not a stay home dad. Your contributions to her education will be denied or minimized. Copy all documents you have for the last 11 years and put the copies in a safe place. You will only win this fight (if it comes to that) by initiating preparations and documentation IMMEDIATELY.
Further, keep an eye out of financials. She may already be cleaning you guys out. You must protect you and the kids...consider raiding the accounts for 1/2 soon and canceling joint cards.
Start interviewing lawyers. You must be prepared and if the threats to file get convincing enough you may have to preempt her in court as the first to file in many states have an advantage.
WHO IS THE CURRENT OM? IS HE MARRIED? KIDS? OM'S PARENTS/SIBLINGS? Exposure is your most popular means off breaking up an affair. I bet anything your wife works with this guy. Exposing them at work will likely be a necessity at some point or another. Don't fret about the economics of her getting fired...they must be separated and this job is not healthy for your marriage anyway (17 affairs...OMG)..plus divorce cost way more in the long run.
Finally, you will make it, with or without your wife, YOU will make it. Plenty of SAHM's (stay at home mothers) do just fine on child support, alimony and a part or full time job. That is if worse comes to worse. However, by agressively fighting for your marriage and inflicting consequences upon the CURRENT infidel in your marriage SHE is much more likely to be pulled from her FOGGINESS and brought to her senses. Then a PROPER recovery is in store.
Good luck,
Mr. Wondering
p.s. - don't worry about your first affair 10 years ago hurting you legally...you both forgave each other and moved forward for 10 years...not an valid excuse for her 17 other affairs...IMO
p.s.s. - take your post over to Infidelity General Questions II Board...much more active over there
p.s.s. - yes I am an attorney, but not divorce...though I have learned much about divorce law posting and reading here the last year.