[dTal]

>Consider that if ending a relationship causes noticeable problems to external observers, it’s almost by definition because you were in it “too long”. That is you developed a strong attachment, shared assets, or had kids with what was in hindsight obviously the wrong person.

Reducing it to "right person / wrong person" is a very narrow viewpoint. People can change in unpredictable ways, including yourself. Relationships end - or continue - for so many reasons, both emotional and pragmatic. It's simply too reductive to say that if a relationship causes pain when it ends, there was necessarily some sort of mistake. It could even be that the pain is a price to pay for a life experience that you'd be worse off for not having...