I know it's late, and I don't know much of the details in your case, but if it's anything like my own experiences, there is maybe a way you could turn this round.
I am saying this to you as someone with a few bittersweet experiences of romance and life of my own, so far, my daughter now 21 is a beautiful product of it, amongst some other beautiful things.
To me our conventional Western View of love and romance has almost damned all possibilities of a successful partnership.
It maybe comes from our religious monotheism, or devotion to money over love, or a mixture of the two. In any case we are prisoners of a strictly monogamous culture.
The ideal of two people perfectly suited to one another in every way, spiritually, mentally, physically, is disastrously outweighed by just statistics, the chances of anyone meeting such an ideal partner is incredibly slim, like winning the lottery. We can be fooled by thinking we won, but things come out in time that disappoint, and if we can't adapt to that then we split.
Its also incredibly selfish, to think one can lay possesion of the other or even of each other, possesion has to turn to hatred sooner or later.
Ego also comes into play. It's nice to have a partner that continually strokes our ego by always saying and acting in a way as if confirming we are the one special person in the world, but for anyone to do forever, they have to be constantly downplaying their own specialness.
Your account of South America brings back some memories of a holiday I spent with someone I was besotted with, the person who won my heart most profoundly, she was from South America, and it's a place of both passion and trajedy. We went to Panama as an attempt to rescue what was already a relationship in tatters, mostly because of what I perceived was her unfounfounded jealousy and suspicion of me. But it was her own desires I think that she was maybe projecting onto me, I seriously had eyes for no one but her, she was a real head turner with an attitude that never failed to attract, nay command attention. And with that there has to be fire, a fire that needs a lot of fuel to keep burning, more than I could supply alone if I am honest.
The solution would have been to "Enlist" some help. She needed more physical attention than just mine, and I actually needed more intellectual attention than just hers, though I convinced myself otherwise, it's the truth in hindsight.
There are ways of doing that without hammering your own ego, ways you could come to terms with her attention not being just focused on you, without it being completely removed from you, believe it or not, it's easily researched.
The traditional Western view of my own failed relationship, there, and the others of my experience, would be that we just weren't suited.
But who is really suited to sacrificing their whole selves, their entire lives to another single person, really? Nobody, I think.
I know with hindsight there were ways I could have made it work, but I just didn't see at the time.
Traditional Western ideals are almost impossible to meet, imho.