This question represents about 85% of why couples seek out counseling. My heart goes out to the client coming into my office with this painful struggle, but I also get energetic because I know, no matter what they ultimately decide, they are smack in the middle of a personal growth spurt. There is some fuel to get past stagnation, even if it has been going on for years and ultimately barely budges forward.
The decision is typically associated with a number of complicated and competing variables. Have you struggled with any of these?