In what I think is, Alex's third (or maybe 4th) party dialogue, he explains to Graciela how he (and Diana) came to be from two different countries,after Alex and Diana's parents split up. The sentence goes :
" In retrospect, I could see they tried to make it go during the last year, but it just didn't feel right"
That sentence looks very ....strange / wrong to me at least. If I read it correctly Alex is saying their parents tried to make their relationship work,
perhaps the sentence should be more like :
"In retrospect, I could see they tried to make it work / I saw/knew they tried to make their relationship work."
The original sentence, might read they -tried- to make their relationship/marriage fail, instead of trying to make it work.
Trade the word GO with WORK ( or maybe think up a new way to word the sentence?)