Hello Cami: I'm sorry you are faced with this most difficult situation. Hopefully being here on PC can be of some comfort & support.

If your husband won't go to counseling or therapy, & is determined to leave the marriage, I don't know what you can do other than to perhaps seek some counseling / therapy for yourself (& perhaps some legal services at some point)in order to help you prepare for what appears to be the inevitable.

Ultimately you only have control of yourself. So my thinking is that the best way, perhaps the only way, to proceed is to simply let your husband do what he chooses to do & prepare yourself for what's to come. Perhaps other members, here on PC, will have other perspectives to offer. I wish you well...