how can something amazing not work out?

I know not every relationship is perfect and all relationships go through ups and downs however why is it that a relationship where the good times are "incredible" does not work?

Communication is great when things are good but communication when either person is stressed, is in two different languages. Miscommunication seems to be the only issue.

Can this be overcome?If this is the only issue?

But what if both are not at the same point in their lives where they can make it work? and see what needs to be done.
Does it just mean they need some maturing (& space?) to do and that one day the relationship will be spot on in all aspects.
Or are these people not right for each other?

How can you not be right for one another when most of the time it is amazing?

How can you speak the same language in loving each other, but when you disagree on something your on a different wavelength and it turns in to a stupid argument and ordeal before you get a break through and back on the same wavelength. Doomed or learning curve.....for yourself or for the relationship?

Had similar experiences - when it was good it was incredible! when it was bad it was complete hell.

I've come to learn that you should not force something to grow when it can grow no longer. Sometimes things and people are not meant to stay together forever.
The reality is that if someone genuinely wants a mutually fulfilling relationship with another they generally will do what it takes to feed it, to make it prosper so that the relationship is always harmonious. Let's face it, who really wants disharmony (is that a word?).
I know if two people want a positive relationship they will both contribute and find ways to move past whatever the 'issues' are so they can heal and continue to move forward together.