This is what the thread is asking = what reasons do people think are good or bad.
This probably highlights a difference between intps and other types...
I was thinking the op wanted "objective" bad reasons to end a relationships. That is, reasons that in all circumstances could be deemed "bad" regardless of other factors involved...or reasons in which you couldn't think of a single scenario in which you could deem it "not bad". IMO, this will never happen (although I would love to be proven wrong)..
If the op was asking for my opinion as to what a "bad reason" is...then I should never have posted in the thread in the first place because my opinion on the issue ultimately doesn't even matter. I guess I take the saying "Opinions are like assholes..everyone has one and they all stink (including, and one could even argue especially, my own)" very seriously. It seems to me (if that was indeed the purpose of this thread) to be a purposeless exercise. All it boils down to is people saying "I don't know, and I have no real evidence that even suggests this is true, so I'm just taking a guess knowing I could be wrong (and when you think about it, I probably am wrong) that XYZ is the case...to which my response would be "Why even talk about it then?"...
But don't let me stop a thread that others may get value from...
In fact, in an effort to not be a damper on things, I'll offer my own (very subjective and ultimately useless to anyone but me (and sometimes it still proves to be useless to me too) ) opinion..
1) If in a marriage your partner's personality/beliefs/lifestyle/physical appearance changes. To me love is unconditional and I would only ever get married if I loved the person so..ending a marriage because my partner changed (and we all change constantly) isn't very nice. I hope someday I find someone who has that same attitude.
I honestly can't think of another reason I would consider bad..