My husband is trying tot get a loan from a bank so he can seperate from me.
Will I be responsible for this debt. He does not know I know this yet, can I interceed
the process? Do I need to?

The loan will be his separate debt. If you have a equity line or joint line of credit from which he can withdraw funds I suggest you call the bank and freeze the same so that none of your joint assets will be encumbered by this loan.