Unlike a confirmed bachelor who will never marry for whatever reason, an 'unconfirmed bachelor' is an older man who wants to marry and has long been seeking a female mate yet remained unsuccessful in that quest thus far.

Whereas being unmarried is not unusual for a man of a younger age, an unmarried man of a certain age may raise questions as to why he remains a bachelor, so calling him an 'unconfirmed bachelor' indicates he's not gay nor opposed to marriage, just unsuccessful thus far at finding a suitable mate.

When you eat dirt for the first time and leave your family to build a shack in the woods