what are the things
that destroyed a good relationship

personality disorders, distance and children/Ex's

Good relationships, eh?

Depends on what you mean by that, but very generally, relationships that seem good, tend to go bad when peoples motivations or personal goals diverge.

Obvious things like, one person wants more new kids, and the other doesn't; or one person wants to live a certain way, or in a certain area, and the other doesn't.

More subtle things are lifestyle related. One person expects a high income, the other is happy at lower levels; one person is a neat freak, the other not at all; one feels antagonized by common daily chores, the other accepts them as normal life.

That kind of stuff.

Alcoholism, drug addiction, lies (well, that one wasn’t a good relationship tho).

Trust and hanging on to ex-s!!

Bad communication. Liars

Death. Life. Change. Identity. Communication.

She wouldn't STFU.

first of all trust. trust will let your relationship destroy. so its really important to have very strong trust

Being skinny, and the Absence of curves.

There is no such thing as a "good" relationship.
There is only a relationship.
A relationship is simply/only defined by how two (or more) people interact with each other.

Whether that interaction is "good" or "bad" constantly changes but is ultimately in the control of the two people.

So "what are the things that destroys 'good' interaction between two (or more) people?"

That should be pretty obvious.

good

Less trust

cheat and doubt

trust

hi

If a relationship was really good people can grow apart after a while.
I doubt it would be anything that can be labelled 'bad' as when bad things can flourish in a relationship it wasn't a good relationship to begin with.