OK, so the latest is that my W wanted me to cosign a home equity loan and now she's asking me to pay her entire amex bill from June, which includes a junket with her sister and her new phone/calling plan which cost nearly 6 times the one I bought for her. Her request seems really presumptious.
No, I would say her request is really ENTITLED. Trust me, and I speak from experience, if your marriage is to ever make it, you will have a much harder time killing the Entitlement beast than you will the Infidelity one.