> Do you feel like there's a good way of measuring whether a relationship is worth saving or not?

kinda depends on what you're looking for in a relationship. all relationships take some level of effort and compromise to maintain. however you measure the "value" of a relationship, it has to at least be better than being single to be worth the trouble. I'd say a relationship is worth saving if a) both partners agree it is better than being single and b) both are willing to take on a roughly symmetrical share of the effort and compromise.

Step one is understanding what the problem is. Most people in a relationship have been arguing about the same inane shit for years that they can't take a step back and look at the big-picture perspective of the problem in their relationship. They might see it as "My wife doesn't want to move to another city I got a fantastic job offer in" but the real problem might be something like "my wife values her social connections in this city" or "my wife doesn't want to interrupt her own career because that provides her a sense of security". Some of these underlying issues can be resolved or negotiated, some can't. If you're dealing with a meta-problem like "my husband is unwilling to compromise on anything" or "my wife has contempt for me", it's quite unlikely that you can fix that and impossible that you can just come to an agreement on that.