Is this acceptable?
Yeah, no way. First you need to know if you are officially separated, so that from this point on, your finances are considered separate as far as new debt and new income. Are you bank accounts separate? Do you have a provisional agreement in place? No way would I let him convince you to do ANYTHING because, as of the time you called it quits as a couple, he is no longer considering your best interests. Financially, he is potentially your enemy until everything is settled and signed by the judge. Big. Huge. Period.