This guy apologizes to a woman named Luiza for not visiting her during his vacation and promises to visit her next time. The stamp on the back says this card was sent on the 9th of July 1924. Luiza is married (the card is sent to her husband’s name). Maybe this guy is a cousin? A friend? The tone is kind of formal (or at least this is how my limited Hungarian knowledge makes me see it) but could he be a secret (and uncommitted) lover?