Houses are meant to stay upright, but relationships are meant to end. Consider all your relationships (romantic or platonic) from middle school, high school, uni, first job, moving to a new city, cofounder etc. the expected, healthy, and natural conclusion for 90% of your lifetime relationships is to end to make room for the next ones. You learn from each one and try to apply from the best to the rest. Sometimes, very few times in life, an end is a failure - but the baseline is that it’s natural and desirable. Unlike your house collapsing.

Relationships certainly change but it’s depressing to assume they will all end. Actually most of my relationships have not ended, except mainly when the other party has died.

That would assume that the above technique is silver bullet that is meant to solve all possible relationship problems.

Such a thing just can't exist. If that is the standard, then you would give up on giving to fix anything in relationship. Since there is a couple that whose issue won't be solved by that, why bother.

Especially with new relationships, you two are basically figuring out whether the couple have compatible value systems, expectations, whether one of them has destructive tendencies it is safer and better to nope out of. It is ok to break up if with the "I realized this is not for me, I think I will be better off with someone else".