Welcome to PsychCentral, Ralphy. You've already received a number of suggestions from other members. However here are links to 6 articles, from PsychCentral's archives, that hopefully may be of some help with figuring out how to proceed here:

When One Spouse Wants Out of the Marriage But the Other Doesn't

Change in Relationships: What to Do When Your Partner Changes

Being Married to a Person with Depression or Bipolar: 6 Survival Tips

The Real Problem With Sexual Withholding in a Marriage | Healing Together for Couples

Are You Ready For Divorce? 8 Questions You Should Answer

https://psychcentral.com/blog/how-to...ge-and-thrive/

I hope you find PC to be of benefit.