is a Bosnian/Croatian/Serbian phrase that translates roughly to "loneliness in marriage" (though "samac" more directly means "a single person" or "bachelor," the phrase is often used to describe feeling alone while being married). The .pdf suffix suggests you may be looking for a specific downloadable document, book, or study on this topic.
It seems you are asking for a text based on a document titled (which translates from Croatian/Serbian/Bosnian to "Alone in Marriage" or "A Lonely Person in Marriage" ). Samac U Braku.pdf
A quietly devastating exploration of intimacy and absence, "Samac u braku" follows a man who moves through the rituals of married life while carrying the weight of solitary thought. Precise, tender, and gently ironic, the story illuminates how the closest relationships can leave the deepest spaces empty. A quietly devastating exploration of intimacy and absence,